Why is my Diablo 2R HUD in the middle of the screen

The HUD control line (with the skills and health/mana orbs) are positioned almost in the middle of the screen, and it’s making it very hard to move and attack below the character.


In Options, the display calibration shows the corners in the top and some 2/3 down, where the HUD is then placed.

Why is this happening, and what can I do about it?

I’m running in Windows 10 Home on a Bootcamp iMac.