There is one experimental workaround (a little risky one, no warranties, use this method on your own risk)
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You need to remember the name of the Toolbar what is missing (out of screen).
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Make sure to close SketchUp.
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Locate the folder (change
your_user_nameto your current real username):
c:\Users\your_user_name\AppData\Local\SketchUp\SketchUp 2023\SketchUp\
(You may need to enable Show hidden files folders in File explorer option to see it)
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Locate the
PrivatePreferences.jsonfile. (Make a backup copy of it, just in case…)
and open it with Notepad app. -
Locate the section in a file where you see the pattern below with the name of missing toolbar
(In the example “Trimble Connect”, but you need to find the section with your missing toolbar name)
Delete like the section marked as blue. Then save the file to its original place with is original name.

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Start SU and see if the toolbar is back to the main screen, if not open in View>>Toolbars and toggle the the missing Toolbar checkbox on/off/on.