[TimeZone]

I don’t quite understand… episodes do get marked in all views with a red angled bar when they have been watched. You can also change the watched/unwatched state with the context menu (it’s a Kodi core function).

Hi Manfeed. Long time, nice to hear from you. 
My understanding was that the user wanted to disable the icon for some episodes or maybe all episodes. As in, they want a watched episode not to show the icon (remove the icon and keep the watched status). I offered them to mark the episode as unwatched then the icon will be removed but the playcount will remain. If this is not what they wanted then I misundertood them as well.