I looked in the User's Manual, and the Options menu should show you a button to check on the bottom that says "OK." I am not seeing this and cannot save my configuration changes. What might be doing wrong/stupid?

Maybe your options lua is read-only or it wasn't found at all?

Are you viewing it in a windowed mode with the bottom of the screen not fully displayed?....have you disabled the VR option as that borks the screen aspect.

Thanks, I will look at this.

Actually, how can I change anything is the "OK" option does not appear?

I had a similar problem a while back and it was because my Oculus headset was detected which ED in their infinite wisdom decided that this would be the default viewpoint. If I recall, I opened up the .lua file and force a very low resolution in order to fit the full screen onto the desktop and was then able to make the relevant changes.

You may be able to open the .lua file and check if your VR settings are enabled or not too. An alternative being to use a 'no VR' switch on your shortcut to launch the game (if that's what is causing the problem)

Another alternative is to use Skate's mod to launch the game and that has a VR switch present. Launcher utilitity

Delete options.lua from DCS folder in Saved Games and start DCS.

I had this problem years ago. Make sure you are running DCS at your monitors native resolution. Hope this helps.

S!Blade<><

Well, I made some progress - I opened "Options.lua" and made "Fullscreen" true and now I can see the "OK" button. I'll try to mess around with it some more later. Thanks for all the tips.