XnView Software

It would be very nice to have setting to remember last full screen state when viewing images.

I used to view images in full screen mode using ACDSee, but with XN View Classic, I need to press F11 key every time I start viewing images.

BTW, XN View Classic is very great!

How do you want it to be the last image in memory after starting the program, or the window memory as its size?

Because the latter is true, and the former would be problematic.

Settings > General > Operations tab > Startup group
Mode when starting with a file: Fullscreen - Edit