UI Builder: Editor extension authoring#

To enable Editor extension authoring for the current UXML document in the UI Builder, either:

  1. Select the Canvas by selecting the root element in the UI Builder's Hierarchy pane.
  2. Under Document Settings enable Editor Extension Authoring.


  1. Select from the top right of the Library pane.
  2. Enable Editor Extension Authoring.

These options will add editor-extension-mode="True" to the root UXML node.