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Once account is created via Wizarr, wait until you see this page to start walkthrough:

Click here to go to the walkthrough page again.

On initial Plex startup, uncheck "Playlists", "Live TV", "Movies & Shows", "Rentals", and "Discover".

You only need "Watchlist", "Movies", "Animes", and "Shows".

You can also unpin them later on the Web App, iOS/Android App, or TV: