How to stop a series recording

I want to stop several series I had previously recorded. I cannot seem to find a way.

I assume you are talking about shows that you had previously schedule. If so you should be able to go into the schedule menu and clink on the show and then click on the shows orange button and click on remove schedule or don’t record.

If there are episodes currently scheduled you might have to go to each scheduled episode and unschedule each episode before the unschedule(remove schedule) TV show works…

If you go into scheduled and are in ALL mode, it will show everything, even if none are scheduled. You can then change it to not record and it will unschedule them after a few seconds.
This assumes you have the subscription service. Manual recordings may be different.