VIEWSONIC XG2560 25" 16:9 LCD Gaming Monitor - Manual (Page 25)

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The Quick-Menu symbol explanation is stated below:
NOTE:
All OSD menus and adjustment screens disappear
automatically after about 15 seconds. This is adjustable through the
OSD timeout setting in the setup menu.
1. After pressing one of the squares, you will see options appear
for quick access.
Game
Mode
Exit
2. After the desired menu control is selected, use the
symbols to navigate and adjust the monitor to
your specified preference.
Each menu function is explained in further detail in 4-2 OSD
Explanation.
3. To save the adjustments and exit, press [ X ] until the OSD
disappears.