Open the YouTube app on your TV
Go to the left menu or profile icon
Select Settings
Select Sign out or Accounts
Confirm Sign out if prompted
If there is no sign-out option, go to Settings on the TV and remove the YouTube account from the device
On some TVs, open the YouTube app on your phone or computer and use Manage devices to remove the TV account
If needed, uninstall and reinstall the YouTube app to clear the signed-in account