Windows 11 touch input maps to main monitor instead of FMC touchscreen in FSX:SE

Touch going to the “wrong” screen in Win11 is almost always a touch-to-display mapping issue

What you’re describing is classic “Windows thinks this touch digitizer belongs to Display 1” behavior. FSX is basically innocent here — it’s just getting the mouse/touch events Windows feeds it.

A few things to try, in this order:

1) Re-do the Win11 touch monitor association (“Press Enter to identify…”) via the legacy Control Panel applet
Microsoft hid a lot of Tablet PC stuff, but the old CPL is still usually there.

• Close FSX.
• Open Start and type: Control Panel
• Go to: Hardware and Sound
• Look for Tablet PC Settings (sometimes it’s still visible even on Win11).
• On the Display tab, click Setup…
• You should get the prompt that says something like “Touch this screen to identify it” and “Press Enter to move to the next screen”.
• When it asks you to touch a screen, touch the Nixdorf.
• When it’s asking for a non-touch screen, use Enter to skip through until it finishes.

If this works, touches should immediately start landing on the correct monitor again.

2) If “Tablet PC Settings” isn’t visible, launch it directly
Even when the link is missing, the applet often still runs.

Try running this from the Run dialog (Win+R):

control /name Microsoft.TabletPCSettings

If that opens the same “Setup…” page, do the steps in #1.

3) Don’t rely on “make the touchscreen the main display” as the workaround
You already found why: FSX really doesn’t enjoy initializing full-screen / primary display logic on a tiny 800x600 panel, and it can scramble window positions during the load.

Once touch is mapped correctly in Windows, you should be able to:

• Keep your big monitor as primary
• Run FSX in windowed mode while arranging panels/pop-outs
• Drag the FMC pop-up to the touchscreen

4) Quick sanity checks that matter with older touch hardware

• Unplug/replug the touchscreen USB (the USB link is usually what defines the “digitizer” device instance).
• Try a different USB port (preferably a rear motherboard port, not a hub).
• Power-cycle the touchscreen if it has its own power brick.

A couple targeted questions so I can narrow it down

• Is your Nixdorf connected by VGA/DVI/HDMI/DP for video, and USB for touch? (Most are, but worth confirming.)
• In Windows 11 Settings -> System -> Display, do you see the touchscreen monitor as Display 3, and is it set to “Extend these displays” (not duplicate)?
• Does control /name Microsoft.TabletPCSettings open on your system, or is it missing/blocked?
• Are you running FSX:SE in true full-screen, or windowed / borderless (Alt+Enter)?

Answer those and I’ll tailor the next steps (there are a couple of fallback options depending on whether Win11 is actually exposing the Tablet PC “Setup” function on your build).