I have been using Drafts on my Mac for quite some time with no issue.
Suddenly today the Action Bar at the bottom of my Mac only shows items fro Markdown; even if select a different Action group on the right side of the interface, the Action Bar does not change. Why might this be?
It sounds like you are trying to change the action bar content by changing the action group. If so,then the reason they don’t sync up is because they are not supposed to - see first paragraph here.
The action bar might typically be changed by the selection on the left, or via the touch bar if you Mac has one and the action bar is loaded into it.
Action bars can also be populated for a workspace to load when the workspace is switched to, and you can also populate an action bar via an action.