There are some differences between XnView and XnView MP in the user interface. In MP version there is lack of "Set selection size" and "set selection ratio" options in the context menu. To use these options, one has to choose it from the Edit menu.
Could you put this option into the context menu or maybe there is a way to achieve it manually?
Set selection size/ratio
Moderators: XnTriq, helmut, xnview