From time to time, often after a Windows update or an NVIDIA Graphics Card driver update, the screens will loose their combined screen resolution which will result in the simulator only loading up onto one screen and not spanning all 3.
The solution is we need to re-enable NVIDIA Surround. Please follow the steps below
Open NVIDIA Control Panel application.
Windows 10: Right click on the desktop background and select NVIDIA Control Panel
Windows 11: Open the NVIDIA Control Panel application from the start menu. You can click the Start Menu and then start typing to quickly search
Under NVIDIA Control Panel, select "Configure Surround" from the navigation on the left.
Ensure "Span displays with surround" at the top left is checked and click "Configure"
This will present a new window to choose the order of the screens. Ensure the "Topology" dropdown is "1x3" which will show three screens to order. Order the screens by dragging them around as per the number presented on the physical screens. This could be "1 2 3", "2 1 3", "3 2 1" or any combination.
Set the Resolution to "7680 x 1440" and the refresh rate to the highest value. This will depend on your monitors and will be "120 Hz", "144 Hz" or "165 Hz"
Note: If 7680 x 1440 is not available, like in the screenshot above, click the + sign next to the resolution dropdown. Select the 7680 x 1440 and use the arrow on screen to make the resolution available. You can then select the correct resolution from the dropdown and proceed.
Click "Enable Surround" or "Apply" if available. The computer will temporarily freeze and the window will become inactive. Please be patient - you may have to wait 30s
Close the window, and all apps sim software should operate as normal.