diff --git a/public/handlers/urlValidator.spec.ts b/public/handlers/urlValidator.spec.ts
index d7d2c3d0..299c556b 100644
--- a/public/handlers/urlValidator.spec.ts
+++ b/public/handlers/urlValidator.spec.ts
@@ -6,7 +6,8 @@ import 'jest';
 import {
     validateAzureIoTHostname,
     validateEventHubHostname,
-    extractEventHubHostname
+    extractEventHubHostname,
+    validatePath
 } from './urlValidator';
 
 describe('validateAzureIoTHostname', () => {
@@ -358,3 +359,66 @@ describe('extractEventHubHostname', () => {
         expect(extractEventHubHostname(connStr)).toBe('mynamespace.servicebus.windows.net');
     });
 });
+
+describe('validatePath', () => {
+    describe('valid paths', () => {
+        it('accepts simple device path', () => {
+            expect(validatePath('devices/mydevice')).toBe(true);
+        });
+
+        it('accepts device ID with dots', () => {
+            expect(validatePath('devices/test.test2')).toBe(true);
+        });
+
+        it('accepts device ID with special characters allowed by IoT Hub', () => {
+            expect(validatePath("devices/my-device_01.v2")).toBe(true);
+        });
+
+        it('accepts module identity path', () => {
+            expect(validatePath('devices/mydevice/modules/mymodule')).toBe(true);
+        });
+
+        it('accepts path with percent-encoded characters', () => {
+            expect(validatePath('devices/my%20device')).toBe(true);
+        });
+
+        it('accepts device query path', () => {
+            expect(validatePath('devices/query')).toBe(true);
+        });
+
+        it('accepts device ID with colon', () => {
+            expect(validatePath('devices/device:001')).toBe(true);
+        });
+
+        it('accepts device ID with @ symbol', () => {
+            expect(validatePath('devices/user@device')).toBe(true);
+        });
+    });
+
+    describe('invalid paths', () => {
+        it('rejects path traversal with double dots', () => {
+            expect(validatePath('devices/../etc/passwd')).toBe(false);
+        });
+
+        it('rejects double slashes', () => {
+            expect(validatePath('devices//mydevice')).toBe(false);
+        });
+
+        it('rejects empty string', () => {
+            expect(validatePath('')).toBe(false);
+        });
+
+        it('rejects null/undefined', () => {
+            expect(validatePath(null as unknown as string)).toBe(false);
+            expect(validatePath(undefined as unknown as string)).toBe(false);
+        });
+
+        it('rejects path with angle brackets', () => {
+            expect(validatePath('devices/<script>')).toBe(false);
+        });
+
+        it('rejects path with backtick', () => {
+            expect(validatePath('devices/test`cmd')).toBe(false);
+        });
+    });
+});
diff --git a/public/handlers/urlValidator.ts b/public/handlers/urlValidator.ts
index efe331fa..f7618b31 100644
--- a/public/handlers/urlValidator.ts
+++ b/public/handlers/urlValidator.ts
@@ -249,16 +249,17 @@ export function validatePath(path: string): boolean {
         return false;
     }
 
-    // Allow alphanumeric, hyphens, underscores, and forward slashes for path segments
-    // But not double slashes, dots (path traversal), or other special chars
-    const pathRegex = /^[a-zA-Z0-9\-_\/]+$/;
-
-    if (!pathRegex.test(path)) {
+    // Block path traversal and double slashes
+    if (path.includes('..') || path.includes('//')) {
         return false;
     }
 
-    // Block path traversal attempts
-    if (path.includes('..') || path.includes('//')) {
+    // Allow characters valid in IoT Hub device/module IDs per Azure documentation:
+    // alphanumeric plus: - . % _ * ? ! ( ) , : = @ $ '
+    // Also allow / for path segments and URL-encoded characters (%XX)
+    const pathRegex = /^[a-zA-Z0-9\-._~:@!$&'()*+,;=%/]+$/;
+
+    if (!pathRegex.test(path)) {
         return false;
     }
 
diff --git a/src/app/css/_resizableDetailsList.scss b/src/app/css/_resizableDetailsList.scss
new file mode 100644
index 00000000..7d9d898f
--- /dev/null
+++ b/src/app/css/_resizableDetailsList.scss
@@ -0,0 +1,34 @@
+/***********************************************************
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License
+ **********************************************************/
+
+// IMPORTANT: style DataGrid header/body cells via these classNames, never an
+// inline `style` prop on DataGridHeaderCell/DataGridCell. Those components
+// spread the consumer's props (including `style`) AFTER the column-sizing
+// props, so an inline `style` overwrites the `width` that resizableColumns
+// injects and the columns silently stop resizing.
+.rdl-header-cell {
+    font-weight: 600;
+}
+
+// Fluent v9 DataGrid does not provide its own horizontal scrollbar (unlike the
+// v8 DetailsList). When the grid can no longer shrink to fit (every column is at
+// its minWidth and the container is narrower than their combined width), wrap it
+// so a horizontal scrollbar appears and all columns stay reachable.
+.rdl-scroll-container {
+    width: 100%;
+    overflow-x: auto;
+}
+
+// Chevron affordance indicating the column header opens an options menu
+// (Resize / keyboard resize), mirroring the v8 column dropdown indicator.
+.rdl-header-chevron {
+    margin-left: 4px;
+    font-size: 12px;
+    flex-shrink: 0;
+}
+
+.rdl-cell {
+    padding-right: 8px;
+}
diff --git a/src/app/shared/resizeDetailsList/resizableDetailsList.tsx b/src/app/shared/resizeDetailsList/resizableDetailsList.tsx
index c6e1efee..dae596b6 100644
--- a/src/app/shared/resizeDetailsList/resizableDetailsList.tsx
+++ b/src/app/shared/resizeDetailsList/resizableDetailsList.tsx
@@ -3,6 +3,7 @@
  * Licensed under the MIT License
  **********************************************************/
 import * as React from 'react';
+import { useTranslation } from 'react-i18next';
 import {
     createTableColumn,
     DataGrid,
@@ -11,10 +12,19 @@ import {
     DataGridHeader,
     DataGridHeaderCell,
     DataGridRow,
+    Menu,
+    MenuItem,
+    MenuList,
+    MenuPopover,
+    MenuTrigger,
     TableColumnDefinition,
     TableColumnSizingOptions,
     TableRowId,
 } from '@fluentui/react-components';
+import { ResourceKeys } from '../../../localization/resourceKeys';
+import { ChevronDownRegular } from '@fluentui/react-icons';
+import { ResizeColumnDialog } from './resizeColumnDialog';
+import '../../css/_resizableDetailsList.scss';
 
 export interface IColumn {
     ariaLabel?: string;
@@ -43,6 +53,7 @@ export interface ResizableDetailsListProps {
     ariaLabel?: string;
     ariaLabelForSelectionColumn?: string;
     ariaLabelForSelectAllCheckbox?: string;
+    autoFitColumns?: boolean;
     checkboxVisibility?: CheckboxVisibility;
     checkButtonAriaLabel?: string | ((item: any) => string); // tslint:disable-line:no-any
     className?: string;
@@ -57,9 +68,11 @@ export interface ResizableDetailsListProps {
 }
 
 export const ResizableDetailsList: React.FC<ResizableDetailsListProps> = props => {
+    const { t } = useTranslation();
     const {
         ariaLabel,
         ariaLabelForSelectAllCheckbox,
+        autoFitColumns = true,
         checkboxVisibility,
         checkButtonAriaLabel,
         className,
@@ -71,6 +84,13 @@ export const ResizableDetailsList: React.FC<ResizableDetailsListProps> = props =
         getRowId: getRowIdProp,
     } = props;
 
+    // Column being resized via the "Resize Column" dialog (undefined when closed).
+    const [resizeColumnId, setResizeColumnId] = React.useState<string | undefined>(undefined);
+    // Captured from the DataGrid header render prop so the dialog (rendered
+    // outside that scope) can apply an exact width via setColumnWidth.
+    const columnSizingRef = React.useRef<any>(null); // tslint:disable-line:no-any
+
+
     const getRowId = React.useCallback(
         (item: any) => getRowIdProp ? getRowIdProp(item) : String(items.indexOf(item)), // tslint:disable-line:no-any
         [getRowIdProp, items]
@@ -128,11 +148,14 @@ export const ResizableDetailsList: React.FC<ResizableDetailsListProps> = props =
     );
 
     return (
+        <>
+        <div className="rdl-scroll-container">
         <DataGrid
             items={items}
             columns={dgColumns}
             getRowId={getRowId}
             resizableColumns={true}
+            resizableColumnsOptions={{ autoFitColumns }}
             columnSizingOptions={columnSizingOptions}
             {...(dgSelectionMode ? { selectionMode: dgSelectionMode, onSelectionChange: handleSelectionChange } : {})}
             className={className}
@@ -144,9 +167,31 @@ export const ResizableDetailsList: React.FC<ResizableDetailsListProps> = props =
                         'aria-label': ariaLabelForSelectAllCheckbox,
                     } : undefined}
                 >
-                    {({ renderHeaderCell }) => (
-                        <DataGridHeaderCell style={{ fontWeight: 600 }}>{renderHeaderCell()}</DataGridHeaderCell>
-                    )}
+                    {({ renderHeaderCell, columnId }, dataGrid) => {
+                        columnSizingRef.current = dataGrid.columnSizing_unstable;
+                        return (
+                            <Menu>
+                                <MenuTrigger disableButtonEnhancement={true}>
+                                    <DataGridHeaderCell
+                                        className="rdl-header-cell"
+                                    >
+                                        <span className="rdl-header-label">{renderHeaderCell()}</span>
+                                        <ChevronDownRegular className="rdl-header-chevron" aria-hidden={true} />
+                                    </DataGridHeaderCell>
+                                </MenuTrigger>
+                                <MenuPopover>
+                                    <MenuList>
+                                        <MenuItem onClick={() => setResizeColumnId(String(columnId))}>
+                                            {t(ResourceKeys.resizableDetailsList.buttons.resize)}
+                                        </MenuItem>
+                                        <MenuItem onClick={dataGrid.columnSizing_unstable.enableKeyboardMode(columnId)}>
+                                            {t(ResourceKeys.resizableDetailsList.buttons.keyboardResize)}
+                                        </MenuItem>
+                                    </MenuList>
+                                </MenuPopover>
+                            </Menu>
+                        );
+                    }}
                 </DataGridRow>
             </DataGridHeader>
             <DataGridBody<any>>
@@ -158,7 +203,7 @@ export const ResizableDetailsList: React.FC<ResizableDetailsListProps> = props =
                         } : undefined}
                     >
                         {({ renderCell }) => (
-                            <DataGridCell focusMode="group" className="rdl-cell" style={{ paddingRight: 8 }}>
+                            <DataGridCell focusMode="group" className="rdl-cell">
                                 {renderCell(item)}
                             </DataGridCell>
                         )}
@@ -166,5 +211,12 @@ export const ResizableDetailsList: React.FC<ResizableDetailsListProps> = props =
                 )}
             </DataGridBody>
         </DataGrid>
+        </div>
+        <ResizeColumnDialog
+            open={resizeColumnId !== undefined}
+            onResize={width => columnSizingRef.current?.setColumnWidth(resizeColumnId, width)}
+            onDismiss={() => setResizeColumnId(undefined)}
+        />
+        </>
     );
 };
diff --git a/src/app/shared/resizeDetailsList/resizeColumnDialog.tsx b/src/app/shared/resizeDetailsList/resizeColumnDialog.tsx
new file mode 100644
index 00000000..733849b9
--- /dev/null
+++ b/src/app/shared/resizeDetailsList/resizeColumnDialog.tsx
@@ -0,0 +1,67 @@
+/***********************************************************
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License
+ **********************************************************/
+import * as React from 'react';
+import { useTranslation } from 'react-i18next';
+import { Button, Dialog, DialogSurface, DialogBody, DialogTitle, DialogContent, DialogActions, Field, Input } from '@fluentui/react-components';
+import { ResourceKeys } from '../../../localization/resourceKeys';
+
+export interface ResizeColumnDialogProps {
+    open: boolean;
+    onResize: (width: number) => void;
+    onDismiss: () => void;
+}
+
+export const ResizeColumnDialog: React.FC<ResizeColumnDialogProps> = ({ open, onResize, onDismiss }) => {
+    const { t } = useTranslation();
+    const [value, setValue] = React.useState<string>('');
+
+    React.useEffect(() => {
+        if (open) {
+            setValue('');
+        }
+    }, [open]);
+
+    const confirm = () => {
+        const width = Number(value);
+        if (width > 0) {
+            onResize(width);
+        }
+        onDismiss();
+    };
+
+    const onKeyDown = (event: React.KeyboardEvent<HTMLInputElement>) => {
+        if (event.key === 'Enter') {
+            event.preventDefault();
+            confirm();
+        }
+    };
+
+    return (
+        <Dialog open={open} onOpenChange={(_e, data) => { if (!data.open) { onDismiss(); } }}>
+            <DialogSurface>
+                <DialogBody>
+                    <DialogTitle>{t(ResourceKeys.resizableDetailsList.content.title)}</DialogTitle>
+                    <DialogContent>
+                        <Field label={t(ResourceKeys.resizableDetailsList.content.subText)}>
+                            <Input
+                                type="number"
+                                min={1}
+                                value={value}
+                                autoFocus={true}
+                                onChange={(_e, data) => setValue(data.value)}
+                                onKeyDown={onKeyDown}
+                                aria-label={t(ResourceKeys.resizableDetailsList.content.subText)}
+                            />
+                        </Field>
+                    </DialogContent>
+                    <DialogActions>
+                        <Button appearance="primary" onClick={confirm}>{t(ResourceKeys.resizableDetailsList.buttons.resize)}</Button>
+                        <Button onClick={onDismiss}>{t(ResourceKeys.resizableDetailsList.buttons.cancel)}</Button>
+                    </DialogActions>
+                </DialogBody>
+            </DialogSurface>
+        </Dialog>
+    );
+};
diff --git a/src/localization/locales/en.json b/src/localization/locales/en.json
index 7d7addbd..581b94a3 100644
--- a/src/localization/locales/en.json
+++ b/src/localization/locales/en.json
@@ -49,8 +49,10 @@
         },
         "buttons": {
             "resize": "Resize",
-            "cancel": "Cancel"
+            "cancel": "Cancel",
+            "keyboardResize": "Resize with keyboard"
         },
+        "columnOptionsAriaLabel": "Column options",
         "defaultAriaLabel": "Data table"
     },
     "header": {
diff --git a/src/localization/resourceKeys.ts b/src/localization/resourceKeys.ts
index caf6342e..7a2669f2 100644
--- a/src/localization/resourceKeys.ts
+++ b/src/localization/resourceKeys.ts
@@ -1015,8 +1015,10 @@ export class ResourceKeys {
    public static resizableDetailsList = {
       buttons : {
          cancel : "resizableDetailsList.buttons.cancel",
+         keyboardResize : "resizableDetailsList.buttons.keyboardResize",
          resize : "resizableDetailsList.buttons.resize",
       },
+      columnOptionsAriaLabel : "resizableDetailsList.columnOptionsAriaLabel",
       content : {
          closeButtonAriaLabel : "resizableDetailsList.content.closeButtonAriaLabel",
          subText : "resizableDetailsList.content.subText",
diff --git a/webpack.common.ts b/webpack.common.ts
index 21b4d22a..02a6cda1 100644
--- a/webpack.common.ts
+++ b/webpack.common.ts
@@ -46,6 +46,14 @@ const config: webpack.Configuration = {
         new webpack.DefinePlugin({
             'process.env.userdnsdomain': JSON.stringify(process.env.userdnsdomain),
           }),
+        // node-polyfill-webpack-plugin v4 no longer injects the `process` global by default
+        // (it was dropped from the plugin's defaultPolyfills set). The packaged Electron renderer
+        // runs without Node integration, so bundled dependencies that reference `process` throw
+        // "process is not defined". Provide it explicitly. The '.js' extension keeps the request
+        // fully specified so it also resolves from strict ESM (.mjs) dependencies.
+        new webpack.ProvidePlugin({
+            process: 'process/browser.js'
+          }),
         new ESLintPlugin({
             extensions: ['ts', 'tsx'],
             failOnError: false,
diff --git a/webpack.dev.ts b/webpack.dev.ts
index 97b8c027..49989d9f 100644
--- a/webpack.dev.ts
+++ b/webpack.dev.ts
@@ -2,7 +2,7 @@
  * Copyright (c) Microsoft Corporation. All rights reserved.
  * Licensed under the MIT License
  **********************************************************/
-import { Configuration as WebpackConfig, NormalModuleReplacementPlugin, ProvidePlugin } from 'webpack';
+import { Configuration as WebpackConfig, NormalModuleReplacementPlugin } from 'webpack';
 import { Configuration as WebpackDevServerConfig } from "webpack-dev-server";
 import { merge } from 'webpack-merge';
 import common from './webpack.common';
@@ -33,9 +33,6 @@ const config: Config = merge(common, {
     },
 
     plugins: [
-        new ProvidePlugin({
-            process: require.resolve('process/browser'),
-        }),
         new NormalModuleReplacementPlugin(
             /(.*)appConfig.ENV(\.*)/,
             resource => resource.request = resource.request.replace(/ENV/, 'electrondev')