Follow these steps if you want to cancel your YouTube TV Subscription on your computer:
Step-1: Open a browser, preferably Chrome, and visit tv.youtube.com.
Step-2: Now click on your profile icon from the top right corner, and click on Settings. Next, click on Membership.
Step-3: Now click on ‘Pause or cancel membership.’
Step-4: Next, click on ‘Cancel Membership’ present in the bottom left corner.
Step-5: Next, you have to choose a reason for canceling. You can choose any reason that suits you. I’d recommend opting ‘cost’ as maybe it’ll make them think that they should reduce it. After selecting a reason, click on ‘Continue Canceling.’
Step-6: The next screen will remind you that you will lose your YouTube TV services after canceling. Just click on ‘Cancel Membership.’
https://tvstreamhelpline.com/how-to-cancel-youtube-tv-subscription/