Have a custom action for Button symbol
The idea is to have a way to change other symbol properties on a button (symbol) click in the run mode. Something like what multistate does, but on a button click instead of conditions.
One use case in mind is to toggle visibility of other symbols to show/hide details of a display. This will help migrate ProcessBook users who use layers for this particular reason.
This could be done with a toolpane that has a dropdown (or list) with all available symbols on the display. Once you chose a symbol, you can add (boolean only for simplicity?) properties you wish to toggle on a button click.
Something like in the attached picture (I don't really like having a dropdown for symbol selection, but I hope this illustrates the idea).