Lock OSD to
Zoom Player's on screen display can be locked to different display-elements.

The "Video Area" is the area in which the display area resides. Since Zoom Player can move the display area within the monitor, the video area is dynamic. Zooming in on a video will enlarge the video area and as such will also affect the on screen display area.

"Fullscreen on Active Monitor" means that the on screen display will cover the entire screen area of the active monitor.

"Custom" lets you specify an exact position and size in pixels.

Custom OSD-Display Lock Area (on the active monitor)
When selecting a Custom position to lock the OSD to, the Lock Area allows you to define an exact position.