Ahh, yes, it does indeed work, and seeing how when using your method, the switcher appears after the filename+proxy icon jump to their age-old, centred spot atop the toolbar, it just seems to confirm that the issue indeed lies with Big Sur/Monterey’s implementation of consolidated title/toolbars.
Thanks for the suggestion! I’ll still stick to my method (I’m running Glyphs on one biiig screen ), but it’s also good to know the issue is already flagged.