I can't figure this out. Clearly someone else has had this issue, but there is no published solution. From your archive:

"Workspaces not working, all panels hidden on start up.
Just update to CC23.0.1 and when I start up Illustrator all the panels are turned off and my workspace won't change or reset.

I can turn on the panels manually, but it resets when I close Illustrator. The reset, new workspace and manage workspaces options are greyed out. If I try to change the workspace nothing happens.

Windows 10 Pro, 64 bit
Intel i7-7700
16GB Ram
GeForce GTX 750 Ti

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Jordon shared this idea · Dec 19, 2018 · Flag idea as inappropriate…
REQUEST TO CONTACT SUPPORT ·

ADMIN
Ashutosh Chaturvedi (Sr. Quality Engineering Manager, Adobe Illustrator) responded · Dec 24, 2018
Please accept my sincere apology for the inconvenience. Please get in touch with us at any of the other support channels – https://helpx.adobe.com/support.html . Since this is not a generic issue that we can reproduce at our end, we will need someone to look into your machine to figure out what is going on here.

Warm Regards,
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator