At 3:21 of this video I demonstrated right-clicking to choose a new panel. Unfortunately (for some incomprehensible reason) Adobe have since removed this function. I live in hope that they'll bring it back, but at the time of writing this note (early 2023) I remain disappointed. New panels have to be added by going to the Window panel, as I explained in the write-up.
In better news, Adobe have replaced the slightly ambiguous "New Workspace" menu item with the more sensible "Save as New Workspace".
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