PIE on Second Monitor BUG / BROKEN?

Development Platform & Builds
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1

I have two 1920x180 monitors.
How do i PIE on the second monitor?The second monitor is above the first in Windows 11 settings. The PIE settings do not save and change when I open the settings:

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Wehn i make a change and click Set As default I would expect that they would save. They do not

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I always get this dialogue

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I always click YES.

if i make New Vieport resolution 1920x1080 and set its position to -1080 to force it onto the top screen, it has a window bar and draws a bit on the bottom screen.

If i set the postion to say -1100, it displays on the bottom screen and then resets New Vieport Resolution to some other figures. So it messes with the settings

As I would like to get PIE to play fullscreen, F11 causes editor on screen 2 to expand to the size of its window, not the PIE window, even if I select it and hit F11.

So do I have to learn Ndisplay in order to make a PIE window fullscreen?

2

that PIE second monitor thing is editor plumbing — Standalone Game window is placed via Slate/GameViewport, not the packaged MoveGameWindow path. the PIE position inputs (NewViewportResolution + position) are logical pixels so -1100 vs -1080 shifts because of window chrome. check GetCurrentWindowMonitorIndex to see which display UE thinks the window is on and verify Windows display arrangement (top vs left changes virtual desktop origin). for packaged builds MoveGameWindowToMonitor handles this without manual offset math — Multi-Monitor Display Controller | Fab