OK - I've done my best to work this out, but I need help )
I have a 3-monitor system : 27" Dell + 27" iMac + 27" Dell.
The issue is that I can't get features to align up well across the 3 monitors ...
The horizon is the same on the 2 Dells, but is offset on the main display.
Diagonal lines don't match when they cross from one display to the other (even accounting for the bezel offset and perspective).
I think the issue relates to the aspect ratios and resolutions of each display ...
The 2 Dells are 1920 x 1200 (16 x 10), but the Mac is 2560 x 1440 (16 x 9) - the iMac is also slightly taller.
I've experimented with the offsets in Settings/Graphics - I can get the horizon to align in the centre of the screen, but then it doesnt align when it's NOT at the centre, and *nothing* aligns during flight.
If I change the Vertical FOV to scale the display, the aspect ratio is no longer 1:1 (bad).
If I change the resolution settings, then the horizontal scale changes as well the vertical scale, to maintain the aspect ratio at 1:1, and I get a small window in the middle of the screen that doesn't stretch across the width of the display.
What I need to do (somehow) is scale the 2 Dell displays to match the vertical HEIGHT (not resolution) of the iMac, then offset the Dells horizontally to align the diagonals.
Any thoughts :)