Comment 4 for bug 1787269

@Hildo, it shouldn't have anything to do with your monitor size. It would appear from your screen-shot that the dialog is growing with each additional 3D model. That shouldn't happen; it should just fill up the room available in the list and then start scrolling. The list should only grow if you drag the dialog larger (in which case the bottom half with the preview should grow slightly faster than the list).