CF Screen Resolution

Hello. I am old player who quitted CF and I came back today. The problem is CF isn't in full screen anymore, there is 2 black stripes 1 to the right one to the left with the ingame resolution of 800x600. Thats what I used to play on before and it used to be full screen. Now to have it full screen ingame I need to put it 1600x900. However, no matter what ingame setting I put, the lobby is never full screen, theres 2 black stripes to the side and it was not like this before. I was running on windows 7 before and now I run it on windows 10 but its still the same computer and the same monitor. Help anyone?
Oh and my recommended setting for the monitor resolution is 1600x900


EDIT: I FOUND OUT HOW.
If you happen to have the same problem go to :
1. Control panel
2. Display
3. Adjust Resolution
4. Advanced Settings
5. Intel R graphic card( the tab on top of the others)
6. Click on scaling
7. Click Scaling full screen
8. Click apply


And to come back to normal:
Same thing for 1. to 6.
7. Click Maintain Aspect Ratio
8. Apply