Macro Groups can be configured to be activated in various ways (such as from the Status Menu or a hot key). The Activate Macro Group action lets you control the activation explicitly (such as from another Macro Group palette).
You can configure the action in similar ways to the Macro Group configuration, specifically:
If you are not showing/hiding a palette, you can optionally have a visual indication of the activation.
Remember that all macros within a Macro Group that is not active will not be available for use. Also, remember that if you hide a palette, that is also deactivating the macro group.