As the core rules suggest you, you can use a Round Marker to know if you are adding or removing the marking bricks from the Minifigs in the current Round. You can of course use a simple white brick 2x2 round for example, but if you want a more sophisticated Round Marker here is the building instruction of my version.
Click on the Prev/Next button to scroll the images of the steps. It's up to you to build a better one if you don't like mine!
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