EDIT: To fix this issue DO NOT DO A FACTORY RESET!!. Roku Support doesn't know what they're doing. "kvgrow" is absolutely correct (thank you, by the way). Simple solution. (1) Go to your mobile device and open up the Roku App (install if not already done). (2) Search for the app, in my case it was YoutubeTV, and then remove it from the mobile app. (3) Go back to your Roku device and search for the app in question. When you select it, it will not longer say "OPEN APP". It will instead say "ADD APP". It will then be back on your Home Page, but as the last app on the list. Click the Astericks (*) to MOVE APP wherever you like.
Not sure how Roku Support Chat, nor Roku Community Moderators, don't know this by now. This thread is 4 pages long over many many months. Thanks again, "kvgrow", you have more desire to understand the device than the people at Roku.