motherboard model / 970a SLT KRAIT EDITIONS (ms-7693)
Graphics card model / NVIDIA GeForce GTX 1060 6GB
Graphics card BIOS VER / nv328mh.1n1
PC MONITOR / LG 29UM68
windows 10 64-bit
Resolution 2680x 1080
when I play Forza 7, 3 inches on each black screen on each side
2680x1080 ?? That seems like an odd choice for resolution and has a different aspect ratio which is probably why you are seeing bars on the sides. If it were to go to full screen at that setting then it would either have to stretch the width and distort everything or would have to crop from the top and bottom. neither of which would be good imo.
I am using 1920x1080 and game is full screen and looks very good
I would suggest that you try a different resolution setting
OP has a widescreen monitor, that’s why he has that resolution. You would need to set the video setting to use " Native Resolution". When you are in a race will it utilize the whole screen. Menus will still be 16:9 unfortunately.
change setting in game or windows?