Limit channels that can be scrolled through

My elderly mother with dementia gets confused when flipping through the channels, especially those that show  "cancel or subscribe to this channel".  
I know how to limit channels on the guide (favorite, free to me, etc). But how do you limit the channels that you scroll through outside the guide? My mom will just keep pushing the UP channel button and there are hundreds of channels that we don’t have access to or are Spanish language. I want only access to a handful of channels.