Update guides/assistant.mdx

Author: mintlify[bot]

guides/assistant.mdx

@@ -30,6 +30,20 @@ You can view assistant usage through your dashboard to understand user behavior
 
 The assistant is enabled by default for Pro and Custom plans. You can manage the assistant from your [dashboard](https://dashboard.mintlify.com/products/assistant/settings), including enabling or disabling it, configuring response handling, and setting a spend limit.
 
+### Assistant entry point
+
+You can configure how users access the assistant by adding the `enableAskAiButton` configuration to your `docs.json` file:
+
+```json
+{
+  "assistant": {
+    "enableAskAiButton": true
+  }
+}
+```
+
+When `enableAskAiButton` is set to `true`, the assistant appears as an "Ask AI" button in the topbar next to the search bar. When set to `false` or omitted, the assistant displays as a floating bar at the bottom of the page (default behavior).
+
 ### Assistant status
 
 Toggle the assistant status to enable or disable the assistant for your documentation site.