With Concepts for Android 2021.10.2 and later, you can set different Air Actions to your S-Pen.
Go to your device's Settings > Advanced Features > S Pen > Air Actions. Turn the Air Actions on, choose Concepts from the list of apps, and enable Air Actions.
You can choose actions for Button Press and Double Press, as well as assign additional Air Actions for your supported stylus.
We are working on additional options for a future release to allow even more configuration of the button action.