diff --git a/packages/opencode/src/cli/cmd/tui/app.tsx b/packages/opencode/src/cli/cmd/tui/app.tsx
index ea742f699708..c2424cc31b9c 100644
--- a/packages/opencode/src/cli/cmd/tui/app.tsx
+++ b/packages/opencode/src/cli/cmd/tui/app.tsx
@@ -712,17 +712,11 @@ function App(props: { onSnapshot?: () => Promise<string[]> }) {
       },
     },
     {
-      title: terminalTitleEnabled() ? "Disable terminal title" : "Enable terminal title",
-      value: "terminal.title.toggle",
-      keybind: "terminal_title_toggle",
+      title: kv.get("sidebar_overlay", true) ? "Disable sidebar overlay" : "Enable sidebar overlay",
+      value: "sidebar_overlay",
       category: "System",
       onSelect: (dialog) => {
-        setTerminalTitleEnabled((prev) => {
-          const next = !prev
-          kv.set("terminal_title_enabled", next)
-          if (!next) renderer.setTerminalTitle("")
-          return next
-        })
+        kv.set("sidebar_overlay", !kv.get("sidebar_overlay", true))
         dialog.clear()
       },
     },
diff --git a/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx b/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
index d43edd2dd5d7..f97edd46418f 100644
--- a/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
+++ b/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
@@ -163,6 +163,7 @@ export function Session() {
   const [showDetails, setShowDetails] = kv.signal("tool_details_visibility", true)
   const [showAssistantMetadata, _setShowAssistantMetadata] = kv.signal("assistant_metadata_visibility", true)
   const [showScrollbar, setShowScrollbar] = kv.signal("scrollbar_visible", false)
+  const [sidebarOverlayEnabled, setSidebarOverlayEnabled] = kv.signal("sidebar_overlay", true)
   const [diffWrapMode] = kv.signal<"word" | "none">("diff_wrap_mode", "word")
   const [_animationsEnabled, _setAnimationsEnabled] = kv.signal("animations_enabled", true)
   const [showGenericToolOutput, setShowGenericToolOutput] = kv.signal("generic_tool_output_visibility", false)
@@ -174,8 +175,12 @@ export function Session() {
     if (sidebar() === "auto" && wide()) return true
     return false
   })
+  const sidebarOverlay = createMemo(() => {
+    if (!sidebarOverlayEnabled()) return false
+    return sidebarVisible() && !wide()
+  })
   const showTimestamps = createMemo(() => timestamps() === "show")
-  const contentWidth = createMemo(() => dimensions().width - (sidebarVisible() ? 42 : 0) - 4)
+  const contentWidth = createMemo(() => dimensions().width - (sidebarVisible() && !sidebarOverlay() ? 42 : 0) - 4)
   const providers = createMemo(() => Model.index(sync.data.provider))
 
   const scrollAcceleration = createMemo(() => getScrollAcceleration(tuiConfig))
@@ -1056,7 +1061,7 @@ export function Session() {
       }}
     >
       <box flexDirection="row">
-        <box flexGrow={1} paddingBottom={1} paddingLeft={2} paddingRight={2} gap={1}>
+        <box flexGrow={1} paddingBottom={1} paddingTop={1} paddingLeft={2} paddingRight={2} gap={1}>
           <Show when={session()}>
             <scrollbox
               ref={(r) => (scroll = r)}
@@ -1211,10 +1216,10 @@ export function Session() {
         </box>
         <Show when={sidebarVisible()}>
           <Switch>
-            <Match when={wide()}>
+            <Match when={!sidebarOverlay()}>
               <Sidebar sessionID={route.sessionID} />
             </Match>
-            <Match when={!wide()}>
+            <Match when={sidebarOverlay()}>
               <box
                 position="absolute"
                 top={0}
diff --git a/packages/opencode/src/config/keybinds.ts b/packages/opencode/src/config/keybinds.ts
index a84fc0b37d58..272681f94497 100644
--- a/packages/opencode/src/config/keybinds.ts
+++ b/packages/opencode/src/config/keybinds.ts
@@ -53,6 +53,7 @@ const KeybindsSchema = Schema.Struct({
   messages_redo: keybind("<leader>r", "Redo message"),
   messages_toggle_conceal: keybind("<leader>h", "Toggle code block concealment in messages"),
   tool_details: keybind("none", "Toggle tool details visibility"),
+  sidebar_overlay_toggle: keybind("none", "Toggle sidebar overlay mode"),
   model_list: keybind("<leader>m", "List available models"),
   model_cycle_recent: keybind("f2", "Next recently used model"),
   model_cycle_recent_reverse: keybind("shift+f2", "Previous recently used model"),