Right as suggested before somewhere on this forum, I think (maybe) that in the future XnView MP's "Settings" should have a switch-able view between a default 'Basic' settings and an expanded 'Expanded' settings all within the same "Settings" window.
I prefer the naming of 'Expanded' better than using 'Advanced' as the name, since I think 'Advanced' gives users an impression of over-complication even before they have explored the particular settings area. So the name 'Expanded' might be better to use initially.
The "Preferences" found in VLC media player (also a Qt GUI software) is a good example of this:


So I think the way the current "Settings" view is (MP v0.39) at time of writing this post should be the view for the "Expanded" and then the "Basic" view would be a much more simpler version.
See here below are my mock-ups (please click on each of the below images to see fully):
Basic view Expanded view -(same as current default XnView MP settings) ....You see then most new features added to XnView MP (usually in the form of tickbox settings) would go in the "Expanded" view. I think that the "Expanded" view could be as detailed as possible for the more experienced/tweak-loving XnView users.
Notice how very basic the "Basic" view is - it is only 5 tabs only!! It is nice like this and would never have to change, so simple just 'code' copying.
-If a user last used the 'Expanded' settings then this would be the remembered settings view for when user next launches the "Settings" window.
-I also reckon that there should be some UI animation in this dialog window when switching between 'Basic' and 'Full'
