I hope I'm wrong, but I suspect you must remove screws/nuts etc from the backside of the dash. I also suspect that it will not pull out toward the inside of the coach, but must be pushed into the dash cavity after the trim bezel is removed.
Here's a write up on removing a different brand monitor from my Holiday Rambler
The other "not so fun" part of this project is removal of the old crt type Intec monitor. It will not side out toward the driver's seat. The case behind the panel is larger than the face plate.
To remove, there are two thumbscrews on each side of the monitor. Remove these. Two screws through the dash hold the aluminum side mounts. There are nuts on the back side of these screws. Remove these side mounts to gain additional space. Push the monitor into the dash. It will now rest happily on many bundles of wires with not enough access to allow removal.
I hope yours is easy to remove.
Fred & Vicki
Richmond Hill, Ga
2000 H.R.Endeavor/Freightliner/330 Cat