Press Esc and click on the cloud icon (Environment). Change the time of day and untick the checkbox under it if it's ticked. If this doesnt work, I don't know what will.
Go to Documents/BeamNG.Drive/settings and delete everything. I think you made an app cover the whole screen by mistake, causing that 'dark-grey' overlay. Also, for the sake of our sanity, and for the ones of people searching for solution to their problem, avoid these 'HELP!!!1!' titles and put something more costructive And caps, we are not blind, caps do not help reading better.
If you want to play with HDR on, Go to options> set the graphics to custom and go into the PostFX menu. Go to HDR and may send some screenshots there
Yes. Set overall quality to custom. click the PostFX button and go to HDR and send screenshots. I might fix it up