Mouse click position differs from actual click position in F10 Map or Mission Editor

[itom]

If the x-coordinate of UIMainView is non-0 in MonitorSetup.lua, the mouse click position is different from the actual click position in F10 map or mission editor, is there a way to work around it?

For some reason, a blank space appears on the right side of the map, and you can't click it unless you click on the extra right side.

Actually, I want to use the middle monitor of the triple display as UIMainView, but it occurs even on one monitor.

[sample]
Viewports =
{
    Center =
    {
          x = 0;
          y = 0;
          width  = 2540;
          height = 1440;
          viewDx = 0;
          viewDy = 0;
          aspect = screen.width / screen.height;
    };
};

GUI =
{
    x      = 500;
    y      = Viewports.Center.y;
    width  = Viewports.Center.width - 500;
    height = Viewports.Center.height;
};

UIMainView       = GUI;
GU_MAIN_VIEWPORT = GUI;