I have just 1 screen and it's acting weirdly

[skypickle]

I have a 3090 connected to 3840x1600 screen with displayport and an LG OLED C2 television connected to the HDMI port of the 3090. The TV is on the right and designated the primary monitor.I deleted the options.lua in Saved Games\DCS.openbeta\Config so that DCS can start fresh.

I start DCS and the game loads onto the main monitor as expected.

The system options show this resolution:

The main monitor is an LG C2 OLED connected by HDMI. In the LG settings, the aspect ratio is set to 'original'. If I try to correct the resolution to 4096 , then the game switches to the monitor on the left.

I tried changing to a display port to HDMI cable for the OLED but it makes no difference. As soon as i bump the resolution to 4k, the game jumps over to the monitor. And it spills over onto the television as well as having the bottom cut off. It sems like the game is putting out 4096x2160 on the wrong display.