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Have your tried restarting Lightroom? Or restarting the computer?
Try pressing F5 (hides/shows the module picker) a few times.
If that doesn't work, try pressing Shift+F a few times to cycle through the screen modes.
If all of the above fails, try resetting the preferences.
Click the icon to launch Lightroom, then immediately press Alt+Shift, and click Yes in the dialog that pops up.
(on my computer, the dialog opens minimized, so keep an eye on the taskbar if it doesn't appear)
Does anything happen when you toggle the show/hide disclosure triangle at the top and center? Does this only happen in the Library module? Can you toggle the Module picker on and off in the develop module?
Hitting <F5> several times: While doing wht it is supposed to do, it does not bring back the module picker.
<Shift>+<f> doesn't help either.
Will try resetting preferences later.
Toggling the upper triangle does what it is supposed to do but does not bring back the module picker.
It is the same in all modules.
Have you completely shut down your computer and restarted?
Toggling the triangle is supposed to hide and show the module picker so I am not sure what you mean by 'Toggling the upper triangle does what it is supposed to do but does not bring back the module picker.'
Well, it hides the pane containing identity plate and module picker. As you see from my screen grab, there are no module names shown to pick from - hence, no module picker proper, only the area it usually occupies.
I don't recall you doing as suggested to Restart the Computer, Reboot the system and test.
Sorry, wasn't able to do the more invasive steps earlier. After restarting not only LR but the whole system last night, the module picker is back. Still interest in why it vanished in the first place.