diff --git a/styles.css b/styles.css
index 95968e2..a7906dc 100644
--- a/styles.css
+++ b/styles.css
@@ -362,6 +362,11 @@ body.block_ai_chat_openfull a#block_ai_chat_openfull {
   color: #007bff;
 }
 
+body.block_ai_chat_chatwindow.block_ai_chat_open .navbar.fixed-top,
+body.block_ai_chat_dockright.block_ai_chat_open .navbar.fixed-top {
+  z-index: 1058;
+}
+
 body.block_ai_chat_dockright.block_ai_chat_open #page-wrapper #page,
 body.block_ai_chat_dockright.block_ai_chat_open #sticky-footer {
   margin-right: 50%;
diff --git a/styles.scss b/styles.scss
index a74ebd0..f5ac388 100644
--- a/styles.scss
+++ b/styles.scss
@@ -442,6 +442,16 @@ body.block_ai_chat_openfull {
     }
 }
 
+// MBS-10833: When the chat window or dock-right panel is open it renders as a modal
+// (z-index 1057). Raise the Boost navbar above it so its popovers
+// (e.g. the user-profile menu) stay visible.
+body.block_ai_chat_chatwindow.block_ai_chat_open,
+body.block_ai_chat_dockright.block_ai_chat_open {
+    .navbar.fixed-top {
+        z-index: 1058;
+    }
+}
+
 body.block_ai_chat_dockright {
     &.block_ai_chat_open {
         #page-wrapper #page,