XnView Software

I see that noDpiScaling does not completely disable scaling. With this argument XnViewMP looks normal scaled like all other applications. Without noDpiScaling XnViewMP adds unnecessary extra scaling. Maybe Qt makes all work and noDpiScaling must be enabled by default.

I'm using 4K display with 150% scaling. Since 0.97 XnViewMP has extremely large UI (pic 1). If I add env variable QT_AUTO_SCREEN_SCALE_FACTOR with value "0", XnViewMP looks great like with noDpiScaling (pic 2). But I think QT_AUTO_SCREEN_SCALE_FACTOR is bad solution, because other apps with Qt 5.15 ...

Many photos don't have "DPI" property but have suitable information in EXIF: "X Resolution" & "Y Resolution".
Is it possible to use EXIF's data to print with correct size if no DPI is set?

XnView Classic has one good feature. It remembers last state of "Keep ratio" option.

In XnView MP every time I opens "Canvas resize" dialog <Default> preset is selected and "Keep ratio" is checked. How to change <Default> preset to modify default state of "Keep ratio"?

Yes. All settings are default. Just installed and ran.
Open program, maximize, double-click on image, go to fullscreen.

I can't use this great program with that ugly moving from center to left-top when going to fullscreen.
Version: 0.93.1 x64 and previous
OS: Windows 10 1809 x64