I recently purchased a Hisense Roku TV for my elderly family member who has dementia. The tiny Roku remote with volume buttons on the side is a poor design for him. The remote never works when he tries to use it due to unintentionally holding mute or volume down while attempting to use the up or down buttons. And the other buttons only further confuse him.
He has a digital antenna that picks up over 50 channels on a clear day. So he only uses the Live TV option. And we found his old remote (that he knows how to use) works only on Live TV. So, I altered the Power On Settings from Home Screen to Live TV. The old remote’s power button luckily powers the Roku on and off - this is the only button that functions outside of Live TV.
In the event it’s an option for others:
Settings > System > Power > Power on > Live TV (or any available input) > press OK to save selection