XnView Software

Hi there, it's been a long time I notice that the Ctrl Tab direction is from right to left rather from left to right traditionally in worldwide software. May you please change the directions of Ctrl Tab from left to right, and Ctrl Shift Tab from right to left?

You means for Tab in XnView? Ctrl+Tab change left to right

No, the truth is Ctrl Tab will be from right to left.

If you want to get technical, you're both wrong. It goes in order of recent selection. Manually select some tabs in a random order, then ctrl+tab, you'll see it bounce around, starting with the one you most recently selected & then working backwards.
Now, since newly opened images open in tabs to the right this means that if you open a bunch of images at once, ctrl+tab will go from right to left. (At least unless/until you manually select some in a different order.)

Can the order simply make it from left to right? It seems a mess! Sometimes go from left to right, but sometimes reversed, sometimes even random!