How to scale Qt fonts and screen for target device

Hi All,

I'm developing UI screen for TFT which has a screen size 480x273.
I can build and upload my program to the device, but fonts are not displayed on the target device if the font size is less than 70.
The font size on the host machine is about 10 or 11, but when I put this app on the target it shows no fonts at all. It only shows fonts with size bigger than 70.
I guess I have an issue with scaling screen on the target device.

Can anyone help with this problem?

Thanks,
Dan

Is the DPI setting for the embedded screen correct?

Cheers,
_