Try removing the ones you don't want using the mobile app on a phone - search for Paramount and hopefully there will be an option to remove it/them. Keep in mind that removing an app doesn't cancel any subscription.
If that doesn't work, I'd probably just move them to the last apps on the Home Screen and ignore them.
Roku Mobile App - Free for iOS® or Android™ | Roku
If you do cancel/stop the auto-renew, you won't get the option to remove them until the current subscription period expires since you still get access until that time.
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