Window size always wrong

When I first log into hs the window is actually an ok size, but the graphic don’t look very crisp. If I select a window size, the graphic get nice and crisp, but every size of available is too big for the screen. I can resize it but it keeps auto-resizing to a size which is too big, meaning I can’t see everything I need to. I have snap windows turned off, Any way I can stop the auto-resizing?