Open the project you are working on from the Apps screen.
Go to the UI Design module and add a Button to your screen.
Select the Button element and open the Properties panel on the right side.
From the + ADD ACTION menu, add the Searching > Get All Source List action according to the trigger event you want (Initial Actions, OnClick, OnBlur, etc.).
Configuring Action Parameters
Collection Name (String - Optional): Only resources belonging to the specified collection name are returned. For example: ‘googledrive1’ → only resources in the googledrive1 collection are listed. If this field is left blank, the Default Collection is used.