Currently, you can hide a show from you calendar or progress page. Hiding from watched progress also hides it from your dashboard on deck. Hiding in those 2 places should work for most users.
This topic proposes a “dropped” status for a show. This would hide from the 3 sections mentioned above + add a “dropped” indicator in places such as the show summary page.nigelwestland commented
Yes, need this. I do want to see them in my progress list, but not on my next to watch. So that people can see in my progress I did see some of it.