feat(modeler): document Desktop Modeler enable-new-context-pad flag (…

…#3870)

Related to camunda/camunda-modeler#4263

docs/components/modeler/desktop-modeler/flags/flags.md

@@ -44,6 +44,7 @@ Flags passed as command line arguments take precedence over those configured via
 | ["zeebe-ssl-certificate"](#zeebe-ssl-certificate)          | `undefined`                         |
 | ["c7-engine-version"](#default-execution-platform-version) | `undefined`                         |
 | ["c8-engine-version"](#default-execution-platform-version) | `undefined`                         |
+| ["enable-new-context-pad"](#new-context-pad)               | `false`                             |
 
 ## Examples
 
@@ -96,7 +97,7 @@ To display a custom version information in the status bar of the app, configure
 
 ```js
 {
-    "display-version": "1.2.3"
+    "display-version": "1.0.0"
 }
 ```
 
@@ -134,3 +135,15 @@ To change default execution platform version, configure your `flags.json` as fol
 ```
 
 New diagrams created in Desktop Modeler will use the configured version instead of the latest stable version.
+
+### New Context Pad
+
+To enable the new context pad, configure your `flags.json` as follows:
+
+```json
+{
+  "enable-new-context-pad": true
+}
+```
+
+![New context pad](./img/new-context-pad.png)