I've got a setup with a high DPI primary and a low DPI secondary screen. When I run the maintenance tool from the low DPI screen the windows seems to be scaled correctly, but the content is not (see Before_resize.png.

Resizing the tool's window fixes the scaling of its content. The X in the upper right corner (for closing the application) cannot be clicked though. As a matter of fact, it can be clicked, but only when the mouse is moved into the X from outside the window and only in a very small area at its edge.