Hi Quisnare,
Welcome to the Roku Community!
We're sorry to hear about the issue you're running into. We understand that you having difficulties logging out of your Paramount + subscription.
Just to verify as mentioned by RokuDanny-R, have you tried navigating to the bottom of the left-hand side menu to Settings > Sign Out?
To try to resolve the issue, we suggest removing the channel, restarting the device then adding the channel back again. Once the channel has been re-added, try to sign in with their channel provider and see if they are still experiencing an issue.
Please try doing this and see if it helps with what you're experiencing.
Best regards,
Mary