Disappearing game piece on a card

This is probably a real rookie question and I imagine the answer will be quite simple.
I want to place a card on the play area and put a game piece on top of it. No problem. But when I click the card to do anything with it the game piece drops beneath it and is no longer visible on top of the card. How can I get the game piece to stay on top of the card? I don’t want it to move with the card, just remain visible.

control your cards and pieces with game piece layers so that the counter always stays on top - see the designer guide for more info on game piece layers