MSFS has no such capability. Using nVidia Surround combines panels into a single monitor. So lets say you have 3 1920x1080 monitors and use nVidia Surround to combine them in a side by side configuation, Windows sees that as a single monitor with a resolution of 5760x1080. MSFS then sees that as a single super ultra wide monitor. MSFS itself has no support for multiple monitors. It can display on a single monitor only.
One of the issues with going ultra-wide or wider in MSFS is lens distortion. The farther you get away from the centre of the image, the more stretched and distorted the image becomes at the extremities with the effect of an ultra-wide fisheye lens. Even with a single UWQHD monitor, I can see this effect at the edges of my screen. This looks terribly unrealistic. Go wider and that view becomes more terrible. This most definitely does nothing for increasing immersion.
Another issue is that nVidia Surround is designed for using monitors “flat” That means all the monitors in the array are on a flat plane with each other. This is not how multi-monitor setups are used for flight sim or other cockpit style sims such as racing, trucking, etc. Typically, the side monitors are angled at anywhere from 40-90 degrees (depending on size of the displays and cockpit style) to give you a full surround view. You want to be able to turn your head left and right and see the same view you would if you were sitting in the actual vehicle and turning your head left and right. You CANNOT get this effect using a single monitor (or nVidia Surround). This gives you a view of the front of the plane only in super ultra wide.
True multi-monitor support allows you to assign a different camera view to each monitor. Your front view is self explanatory. The left and right monitors are assigned a camera that looks as if you were turning your head in that direction. This is what MSFS is currently lacking that X-Plane does so well.
This isn’t just for that 1.5% of people as you think my friend. People are using that contiguous vew now because they have no other option. Introduce proper multi-monitor support to get rid of that ugly lens distortion at the edges of the screen and I can guarantee people will be all over that like white on rice.