A long time ago, @Lynn asked about why the color of a “Display overlay” action cannot be formatted via a format rule. The issue seems to be unresolved so I am reposting it as a bug:
Same problem here. I cannot change the color of overlay actions
Yeah, they currently only seem linked to Primary color of the theme.
Thanks for your responses. Here are two feature requests that are related to this:
This bug also seems to apply to the color of actions in the upper right of a table view when you select multiple records. They all default to black.
Yes, overlay actions should be able to switch colors. This would make my app look better.