I just got mobile app ios Version 4.2.15. Seems like the last row of controls are missing - all three volume buttons. Is this the new version? The picture on the app store has a different remote. I wanted the mute button.
You get a different set of controls based on Roku model (TV and/or Set-top-box). I imagine the mute button would be specific to the Roku TV models. In my case the Private listening button is removed on models that don't support it.