How to reset Plex?

I had Plex running for years on my Windows machine but just started it up on a new Mac and have so many issues with it now. Is it possible to reset the entire thing and just start over? Basically the issues I am having are:

  1. Cannot find server on Plex app on TV.
  2. Cannot play movies from Plex website console, just get an error.
  3. Cannot delete devices- says “cannot delete at this time”.
  4. Sometimes it won’t find a server so if I shut down the browser and open it back up, sometimes it will find my movies again. Other times I have to uninstall the app and reinstall it.

Just seems like some colossal problems that could be solved if I could just wipe everything and start fresh? Any ideas?

Thanks!

How do you do this on windows?

https://support.plex.tv/articles/201941078-uninstall-plex-media-server/