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I'm referring to the popover menu that opens when clicking the little down arrow next to the file name in some apps.
I use that extensively—it would be convenient if there were a keyboard shortcut to open it, but I haven't found one yet.
I don't know of one, but you can of course use Command I (Get Info) in the Finder to change the name or assign Tags.
Command + S when you have the file open. In finder maybe Command + space. Those are the only options I know...