diff --git a/packages/opencode/src/cli/cmd/tui/ui/dialog.tsx b/packages/opencode/src/cli/cmd/tui/ui/dialog.tsx
index 43f1a1ff58d..b1f518043d5 100644
--- a/packages/opencode/src/cli/cmd/tui/ui/dialog.tsx
+++ b/packages/opencode/src/cli/cmd/tui/ui/dialog.tsx
@@ -6,6 +6,7 @@ import { createStore } from "solid-js/store"
 import { useToast } from "./toast"
 import { Flag } from "@/flag/flag"
 import { Selection } from "@tui/util/selection"
+import { useSync } from "@tui/context/sync"
 
 export function Dialog(
   props: ParentProps<{
@@ -16,6 +17,10 @@ export function Dialog(
   const dimensions = useTerminalDimensions()
   const { theme } = useTheme()
   const renderer = useRenderer()
+  const sync = useSync()
+
+  const overlayMode = () => sync.data.config.experimental?.dialog_background_overlay ?? "full"
+  const showOverlay = () => overlayMode() === "full"
 
   let dismiss = false
 
@@ -38,7 +43,7 @@ export function Dialog(
       paddingTop={dimensions().height / 4}
       left={0}
       top={0}
-      backgroundColor={RGBA.fromInts(0, 0, 0, 150)}
+      backgroundColor={showOverlay() ? RGBA.fromInts(0, 0, 0, 150) : undefined}
     >
       <box
         onMouseUp={(e) => {
diff --git a/packages/opencode/src/config/config.ts b/packages/opencode/src/config/config.ts
index 47afdfd7d0f..1b78b2a1344 100644
--- a/packages/opencode/src/config/config.ts
+++ b/packages/opencode/src/config/config.ts
@@ -1225,6 +1225,10 @@ export namespace Config {
             .positive()
             .optional()
             .describe("Timeout in milliseconds for model context protocol (MCP) requests"),
+          dialog_background_overlay: z
+            .enum(["full", "limited", "none"])
+            .optional()
+            .describe("Control dialog background overlay: 'full' = semi-transparent overlay (default), 'limited' = overlay only within dialog bounds, 'none' = no overlay"),
         })
         .optional(),
     })
diff --git a/packages/sdk/js/src/v2/gen/types.gen.ts b/packages/sdk/js/src/v2/gen/types.gen.ts
index ec797f2ba81..22a51df853e 100644
--- a/packages/sdk/js/src/v2/gen/types.gen.ts
+++ b/packages/sdk/js/src/v2/gen/types.gen.ts
@@ -1503,6 +1503,10 @@ export type Config = {
      * Timeout in milliseconds for model context protocol (MCP) requests
      */
     mcp_timeout?: number
+    /**
+     * Control dialog background overlay: 'full' = semi-transparent overlay (default), 'limited' = overlay only within dialog bounds, 'none' = no overlay
+     */
+    dialog_background_overlay?: 'full' | 'limited' | 'none'
   }
 }