I asked for this back in July of 2016!
https://forums.plex.tv/t/delete-poster/151538
Sometimes in my zeal to customize my Plex, I download posters from Thetvdb.com and save them into the Season folders, then I click on the pencil to edit the Season info and go to poster on the left in the edit dialog.Some nights I forget to change to the correct Season and end up with Season 2 posters in Season 3. Here’s the feature request. A right click menu item “delete poster” so I can highlight the poster that I added by mistake and delete it. Love Plex soo much. Thanks to all the deve…
Fred