Mar 14 2020
For some reason, my view choice dropdown has disappeared from all list view pages across the site. They showed previously.
The only thing that has changed I know of is that I've had to toggle back and forth with classic experience in order to get a printer-friendly newsletter view to work.
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Mar 16 2020
It was a cookies issue. I cleared all cookies, logged back on, went to the lists, and everything was back to normal.