A warm welcome here in the Roku Community, @sarahjeffrey928.
We appreciate you for raising your suggestion here with us.
We suggest installing the Roku mobile app to control the volume of your TV. This is the only option we can suggest at the moment but no worries! We hear you and appreciate your feedback.
Please let us know if there's anything else we can be of assistance with and we'd be more than happy to continue doing so.
Best regards,
Carly
Carly Y.
Roku Community Moderator