Porting my application from PySide2 version 5.14.1 to PySide6 6.2.4 I noticed that the app menus would always show on my left-most monitor. The app would always start on the left most monitor too, whereas the older code would start on the primary monitor (center). I'm filing this bug under Qt instead of PySide because I don't think it's related to PySide at all and hopefully it'll get more eyes on the bug here.

I have a multiple monitor setup, but Qt6 seems to think I have only one monitor?

Qt6:

In [8]: screens = app.screens()

In [9]: screens

Out[9]: [<PySide6.QtGui.QScreen(0x2b0725a5350, name="ASUS VH232H") at 0x000002B073B27840>]

Qt5:

In [3]: app.screens()

Out[3]:
[<PySide2.QtGui.QScreen(0x253f28f4610, name="\\\\.
DISPLAY3") at 0x00000253F4114B00>,
<PySide2.QtGui.QScreen(0x253f28f4110, name="\\\\.
DISPLAY1") at 0x00000253F4114D00>,
<PySide2.QtGui.QScreen(0x253f28f46d0, name="\\\\.
DISPLAY2") at 0x00000253F4114C80>]

All 3 monitors are all the same make and model, all at the same resolution, all attached to a single video card (Radeon RX 570).

Seems directly related to QTBUG-97533