After the changes made in T86865, which made the form a bit taller, the "Move page" button on Special:MovePage often appears below the fold (you have to scroll to see it).
At 1920x1080px (probably the most common desktop resolution), it usually just barely fits (the screenshot below has 3 checkboxes, but up to 6 can be displayed). At 1366x768px (very common low-end laptop resolution) you have to scroll.