Art zoom in 1:1 is bigger on screen then 100% in Lightroom

Hi, i am on mac mini m1 with benq sw270c monitor at resolution of 2560x1440.

If I open an image in Lightroom on that monitor and zoom to 100% it looks ok.
Photoshop shows it at the same size.
BUT if I open the same image in art and zoom to 1:1 the image looks twice as big on the screen as the ones in Lr and Ps.
To have them similar, i have to zoom to 50% in Art.

What could cause this ?

Hi, it’s probably a problem with high dpi / retina displays. What happens if you change the value of “pseudo hidpi mode” in preferences?

You are right !

The resolution setting on my mac for the sw270c was 2560x1440 ( this is the hidpi )
There is also a 2560x1440 low resolution setting ( this is the non-hidpi )

I have set the resolution on my mac to 2560x1440 non-hidpi and now the scaling looks fine.

Thanks