Just in case there are others who learn as slow as I do
In order to remove it, I found that there are adjusters for tilting the TV at the top and rear of the TV bracket. They are plastic knurled knobs, and on mine, so tight, I needed pliers to loosen them. They locked the TV in a vertical position, so that there was not enough clearance when lifting the TV to allow it to come out of the channel holding the top in.
Once loosened and the TV tilted forward at the top, it lifted right out.
Now I know why I never elected to become an engineer.
(Although, it has happened where I was called an f'n engineer in the past)
Thanks to all who replied.
Ken & Laurie
2015 Berkshire 400QL
2016 Chevy Colorado