You can use this tricks:
https://forums.sketchup.com/t/quantyfier-pro-main-dialoge-box-does-not-appear/262437/2?u=dezmo
https://forums.sketchup.com/t/im-using-multiple-monitors-but-i-got-a-really-crazy-situation/261418/9?u=dezmo
or
https://forums.sketchup.com/t/resetting-html-dialog-window-location/243756/16?u=dezmo
That is a little more problematic, but can be handled:
https://forums.sketchup.com/t/im-using-multiple-monitors-but-i-got-a-really-crazy-situation/261418/11?u=dezmo