Overlay issue

I’m wanting to have an add person option in my app where you can select multiple people to add to your party and have the button change colors then join the game.

I’m using overlay to change the color of the button can only do this for one person at a time not multiple. Is there a way to change to color of multiple buttons (think checkboxes not radio buttons)

Second once I use the overlay feature then the scroll option is out.

Can I fix these issues in Figma?