If you resize the XnViewMP window (maximize / restore it) in layout 2 mode, the width of the thumbnail pane is not remembered (see screenshots).
Also, when you reduce the size of the XnViewMP window, first the width of the thumbnail pane is reduced, then the width of the preview pane. In XnView Classic, it's the other way round: first the preview pane is resized, then the thumbnail pane. I like this behavior more, since I want the number of columns of thumbs to be stable.
Similar problems exist with other layouts too. I tested it with XnViewMP 0.94 x64 under Windows 10, but this bug existed in earlier versions too.
Layout: Position of divider not remembered when resizing window
Moderators: helmut, XnTriq, xnview, Dreamer
Re: Layout: Position of divider not remembered when resizing window

Pierre.