Qt Creator 4.14 cannot get correct pixel density.

[XIVN1987]

I start qt creator by command below:

set QT_AUTO_SCREEN_SCALE_FACTOR=1
C:\Programs\QtCreator\bin\qtcreator.exe

or

set QT_ENABLE_HIGHDPI_SCALING=1
C:\Programs\QtCreator\bin\qtcreator.exe

The ui in qt creator is magnified to 2 times, and all widgets look very large.
It looks like Qt Creator is not getting the right pixel density ( I think it's 1.5 times).
how to solve the problem?
Thanks a lot.