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Re-Enable Modern Lists & Libraries
So let's say a particular user (me) was needing to check in a document in the Style Library but, upon discovering they couldn't in the new modern view, clicked the "Return to classic SharePoint" in t...
From what I have found the Return to Classic is just a temporary revert. This sets a browser cookie that causes the everything to show the classic format. I did not look very deep, but I think this is just a session cookie, so if you close your browser and open a new one you should get the modern look again.
You can force the new experience per list/document library in the list/document library configuration...alternatively you can ensure is enabled by default at the site level using PowerShell
For some reason our list does not have the option for modern site in our configuration settings. Is there a reason a list would not show that option?