The Show Palette of Macros action gives you access to the Conflict Palette facility with your choice of macros. You can choose any selection of macros, and selecting a macro group is just a short form for selecting the contained macros.
The Activate Macro Group action and its variants, including Show Palette for One Action allow you to explicitly control the activation of a macro group. The palette you get is the macro groups.
I could, but I'm not going to - it ads clutter and confusion that would almost never be warranted. Set the macro group to Show Palette Until or Show/Hide Palette When and don't configure any options, which more accurately expressed what you are doing and allows you to configure the palette.