It is in UI Layer. If you set the Reset VR View to something other than Num 5 in the Keyboard category it will work, if you leave it blank it will always default to Num 5.
It has been a while since I used the Steam version of DCS (I transferred to standalone some time ago) but I assume it works like other Steam products and you can enable beta under properties (right click the game in the library and click on Properties)
You should see a beta option in the left hand column, click on that and you can select beta from the drop down.
Should you wish to use open beta I would recommend backing up your Saved Games\DCS\Config folder just to be safe.
If you get a new Saved Games\DCS.Openbeta folder after converting then you can copy your config folder to this one. I cannot recall if you get two separate folders (I know I do for standalone)
There is a wealth of knowledge of DCS installations on here so pretty much any problems you might encounter I am sure will be promptly answered.
Baldrick33's post in Numpad 5 resets VR view in every aircraft, but where is it assigned? Cant unassing it. was marked as the answer