Can't get Page State to Work with Dropdown

I am going around on circles with this so I appreciate your help and apologise if this turns out to be a really simple solution.

I am new to App/Page/Component States and though the documentation looks simple enough, I haven't been able to get it to work on my form.

Essentially, a user makes a selection from a multiselect dropdown and I want to clear the selection by the user clicking a button. As there is no option to reset a dropdown like there is with choice chips / checkbox widgets, I thought I could achieve the same result through a Page State.

I have set up a Page State dropboxClear to be True on the Page Load. From there, the Page State switches to False when a selection is made, but I can't figure out what I need to do with the action button to then clear the values / reset the field. All I seem to be doing is changing the Page State back and forth (the Action Button then resets the Page State).

I feel this will be a simple answer, but I am just going around in circles at this point. Any help is appreciated.