4.21 PIE Issues in High DPI

Using a High DPI monitor with a multiple players PIE window results in the 2nd PIE window not saving its location when moved around. Using a monitor with a smaller DPI scale the 2nd window will save its screen location when moved.

This issue only reproduces on a high DPI monitors - Tested at 3840 x 2160 with 150% scaling.

1. Open up the Editor preferences and ensure that High DPI support is enabled.
2. Change the PIE settings to have more than 1 player. (Tested with 2)
3. Press PIE
4. The 2nd player window that pops up, drag it to some other location on the High DPI monitor.
5. Close out of PIE
6. Press PIE again. 

Results: The 2nd PIE window will always default to the same spot.

Expected: The 2nd PIE window will save its previous position and scale like it normally does on lower DPI monitors. 

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