Amazon recently released an important update for Fire TV devices that significantly improves the user experience, especially if you bounce between different streaming services and tend to lose track.
After the latest update, content from other streaming providers will also be listed in the watchlist and in the continue watching areas alongside the usual Amazon Prime stuff. If you start watching something from another platform, or add a film or series to your watchlist on another platform, all of that will also appear in the Fire TV overview (provided the content has been started on your Fire TV).
Netflix, Disney+, Apple TV+, Paramount, RTL, and WOW are among those included in the shared watchlist. Unfortunately, it doesn’t appear to be possible to organize the list manually as it’s alway

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