Why Can I Move a Label Horizontally but Not Vertically in an xy_panel?

I’m trying to position a Label inside an xy_panel using the mouse. I can move the Label horizontally (left and right), but I can’t move it vertically (up and down). The xy_panel has a height of 600. I know it’s possible to manually set the x and y coordinates in the component’s container settings, but being able to adjust it directly with the mouse would be much more convenient. Am I missing something or doing something wrong?