diff --git a/examples/issue_19_demo.rs b/examples/issue_19_demo.rs
index e88e604..4d5c176 100644
--- a/examples/issue_19_demo.rs
+++ b/examples/issue_19_demo.rs
@@ -92,7 +92,6 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         AppEvent::OpenSettings,
         AppEvent::CloseSettings,
         AppEvent::SettingsAction(SettingsAction::ChangeTheme(ThemeVariant::EverforestDark)),
-        AppEvent::ToggleTheme,
         AppEvent::Quit,
     ];
 
@@ -109,7 +108,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     println!("✅ No state machine edge cases or deadlocks");
 
     println!("\n🎨 State Machine Workflow:");
-    println!("• Main → Settings: ',' key (AppEvent::OpenSettings)");
+    println!("• Main → Settings: 'S' key (AppEvent::OpenSettings)");
     println!("• Settings → Main: ESC key (AppEvent::CloseSettings)");
     println!("• Theme changes: Apply immediately via SettingsAction");
     println!("• State persistence: Previous state remembered for ESC");
diff --git a/src/events.rs b/src/events.rs
index a5ea98a..58c1ec3 100644
--- a/src/events.rs
+++ b/src/events.rs
@@ -10,8 +10,6 @@ use std::time::Duration;
 pub enum AppEvent {
     /// User requested to quit the application
     Quit,
-    /// User requested to toggle the theme variant
-    ToggleTheme,
     /// User requested to open settings modal
     OpenSettings,
     /// User requested to close settings modal
diff --git a/src/ui/app.rs b/src/ui/app.rs
index 80a37f8..6fee2d3 100644
--- a/src/ui/app.rs
+++ b/src/ui/app.rs
@@ -185,10 +185,6 @@ impl App {
                     self.state = AppState::Error(format!("Settings error: {}", e));
                 }
             }
-            AppEvent::ToggleTheme => {
-                // T key functionality removed in Issue #21
-                // Theme changes now only available through settings modal
-            }
             AppEvent::Resize(width, height) => {
                 self.last_size = Some((width, height));
                 // Layout will be recalculated in the next draw call