Hi @TimF-9ded, welcome to the community, and thanks for posting!
For one solution, you could create another automation action that has the same formula wrapped with the NOT() function. That action would then execute if the criteria is not met.
You could also set up data validation, in which you could verify that conditions are met prior to a certain button being visible to a user.
Hope those ideas help! Do those solutions meet your ask, or is there something more that would be helpful?
For your question: To add more actions to the same button, select the button, and in the properties window, click on the Actions tabs. Click "Edit automation", and you'll see the "Add actions" button in automation (located below the actions you may have already added):