Annoying Screen app removal

There MUST be a way to get rid of these annoying channel/apps Xfinity is putting on the bottom of the screen. It was there all through the Olympics. Everything we went to use the last channel, there it was. Now college ball is there. Well, my husband watches lots of college games al9ng with other things and that uses up one of his channels.  Sounds minor, but it's not to him.  How do you get rid of it?? He already tried going through the preferences,  all that did was lock up the guide causing us to have to unplug the box to get out of it. Help!!