Night Owl ADV1-168500 user manual - Manual (Page 33)

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14.3.1.1 Mask Screen
Use the Mask Screen to block out certain areas of a channel screen.
To access the Mask Screen, select the Basic button, and then select
Display from the list on the left side of the screen. Select the Settings
button in the Mask column.

CH: Indicates the channel that you will be configuring.

Once you have selected the channel, left-click the mouse on the
screen.

Drag the mouse over the area of the screen you would like to block
out.

If you want to block out a different area or no area at all, select the
Clear button.

Once you have selected an area to block out, select the Apply
button. This allows you to return to the menu screen.
Chapter 14: Basic Menu