Ah yes, I see.
So how do we do a feature request?
Make a thread there, or vote for an existing suggestion! I think there might already be a few hahaha.
https://forums.trakt.tv/t/ability-to-change-posters-and-backgrounds-for-personal-view
So, everyone in the thread, please click the link and vote. 
Well Justin wanted to look into it in 2023 and 2024… I’m sure he’ll still be looking into it in 2026 lol
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It seems, though, the more votes it gets, the higher the priority.
The higher the priority, the higher up the list it goes.