Control Bar Side Margins
The size of the space (in pixels) to keep between the left/right sides of the screen and the control bar.

Control Bar Y-Offset
The size of the space (in pixels) to keep between the top/bottom of the screen and the control bar.

Fixed Control Bar Width in Fullscreen / Zoom mode
Limit the width of the control bar to a specific size.

Position the Control Bar relative to the Video Area (taking the aspect ratio into consideration)
This setting controls whether the control bar appears within the video area or relative to the display area. The difference between the two is that if your display area is 4:3 and the video you are currently viewing is 16:9, with this setting enabled, the control bar would appear within the video area and with this setting disabled, the control bar would appear below the video area.

Video-Align the Control Bar to
Where should the control bar be displayed (top/center/bottom of display area).

Screen-Align the Control Bar to
This setting overrides several other control bar placement settings and allows you to have the control bar outside the Zoom Player window, aligned to the top/bottom of the screen.