How to show favourites as widgets?

I am trying to modify the main menu, so that an item’s widgets show my list of Favourites.

I must be missing something fairly obvious here. I can make the menu item click open Favourites, but I am not seeing the same options when looking under widgets. I tried copying “ActivateWindow(favourites)” from the click action into widgets, but that didn’t do anything.

What am I missing here?