Apple AppleVision monitors (OS 7.1) - Manual (Page 51)

Turning overscan on and off
Overscan moves the screen image as far to the edges of the screen as possible.
This setting is not recommended for normal use, but can be useful for
viewing video.
To turn overscan on or off, follow these steps:
1 Open the Monitors & Sound control panel, then click the Geometry button.
2 To turn overscan on, click On.
The screen image expands until there is a smaller black border between the
image and the edge of the screen.
Note: When overscan is on, you cannot adjust screen geometry or
convergence.
3 To turn overscan off, click Off.
The screen image returns to its previous size.
4 Close the Monitors & Sound control panel.
IMPORTANT When overscan is on, you may not be able to choose commands
from the menus at the top of the monitor. If this occurs, you can’t use a menu
to open the Monitors & Sound control panel. Instead, push one of the control
buttons on the left front of your display. The Monitors & Sound control panel
will open automatically.
51 Geometry Settings