As I understand it, the only way to remove a programme from 'Continue Watching' is to go to the end of the last episode, then the system thinks you've finished.
I've done this with programmes - to get rid of them on my list because they were awful - and now I'm having them dictate my "because you watched" recommendations! Is there a way of, effectively, telling the system I haven't watched them, or don't want recommendations based on them?
Not that I am aware of to be honest. You could try speaking with staff via live chat and see what they say.
Make sure you are signed in and use the drop down at 'How to get in touch'. This will give you access to live chat.