Literally I did nothing at all. This happened today when I opened the web interface with absolutely 0 changes from me to my library layout/etc that worked fine for 4 years now.
so IOS app - works as intended or as it did for years.
clicking Plex Server and open Plex to Web (which uses the IP address) - works as intended or as it did for years.
Plex on Roku - same as above.
Plex app on Windows - same as above.
I open a browser and go to app.plex.tv which opens Plex for Web and the library mode only shows movies alphabetical, no collections whatsoever.
