What stays in this browser
Saved title choices, episode checkpoints, viewing-country preference and recently browsed titles use local browser storage. They support your return visits without a Supernova sign-in. Clearing site data can remove them.
External destinations
Posters and movie artwork are requested from TMDB image servers. Watch now opens JustWatch with the title in the search address and your selected country in the path. Those destinations operate their own services and privacy terms.
Shared devices and backups
Someone using the same browser profile may see its saved list. Keep backup text private if you do not want to share those choices. A backup is optional and can be useful before a browser change.
The Recently browsed page lets you clear its local history. Removing a title from My List and clearing a checkpoint are separate actions. This page describes the browsing features here; it does not describe the account or viewing-history settings of an external service.