Document x-mint playground expandSections setting

api-playground/openapi-setup.mdx

@@ -183,7 +183,7 @@
 }
 ```
 
 The `x-default` extension supports `apiKey` and `http` bearer security scheme types. The value appears as the default input in the playground's authentication fields. Prefill for security schemes is unconditional and does not require any additional configuration.
 
 Use `x-default` on other schema properties in your OpenAPI specification to set a default value in the API playground without affecting the `default` field in the schema definition. Unlike security schemes, prefill for non-security-scheme properties only takes effect when you set [`api.examples.prefill`](/organize/settings-api) to `true` in your [`docs.json`](/api-playground/overview#example-configuration).
 
@@ -200,7 +200,7 @@
 When enabled, clicking the option downloads your OpenAPI spec directly. Deployments with multiple specs receive them bundled as `api-specs.zip`. On deployments behind `auth` or `userAuth`, only authenticated readers can download the spec.
 
 <Warning>
   The downloaded OpenAPI spec is unfiltered and does not respect [authentication groups](/deploy/authentication-setup). Any authenticated reader who can open the contextual menu receives the full spec, including endpoints and schemas that would otherwise be hidden from their group. Do not enable `download-spec` on an authenticated site if your OpenAPI spec contains endpoints or fields you consider sensitive.
 </Warning>
 
 ## Customize your endpoint pages
@@ -311,6 +311,27 @@
 }
 ```
 
+### Collapse playground sections
+
+Collapse the request sections of the API playground by default using `x-mint: playground` with `expandSections: false` on any operation. When collapsed, readers expand only the sections they want to interact with, like Authorization, Headers, Query, Path, Body, and Server. Sections are expanded by default when `expandSections` is not set.
+
+```json {6-10}
+{
+  "paths": {
+    "/users": {
+      "get": {
+        "summary": "Get users",
+        "x-mint": {
+          "playground": {
+            "expandSections": false
+          }
+        }
+      }
+    }
+  }
+}
+```
+
 ### Parameter pills
 
 Annotate parameters in the API reference and playground with custom pill labels using `x-mint.pre` and `x-mint.post` on any schema. Pills defined with `x-mint.pre` render before the parameter name, and pills defined with `x-mint.post` render after it, alongside Mintlify's built-in pills like `required`, `read-only`, and `write-only`.