How to specify palette specs when using the Show Macro Group as Palette for one action?

If I display a palette using the Show Macro Group as Palette for one action, how do I specify all the palette specs such as color, font size, number of columns, what is displayed, etc ?
thanks in advance for your time and help

Screenshot (click to expand/collapse)

It uses the Macro Group's palette, as shown here:

You can double-click the palette image to open the editor and set it how you want. If you then set the "Activated" option back to what you want, eg "Always activated", the palette settings continue to be honoured in the "Show Macro Group" action.

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thank you very much. I should have guessed !