Dell C2723H 27" Video Conferencing Monitor - Manual (Page 59)

Operating the Monitor
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Menu Select this option to adjust the settings of the OSD,
such as, the languages of the OSD, the amount of
time the menu remains on screen, and so on.
Rotation Press the joystick to rotate the OSD and the screen
by 0/90/180/270 degrees.
You can adjust the menu according to your display
rotation.
Transparency Select this option to change the menu transparency
by toggling the joystick
up or down (Range: 0 - 100).
Timer Sets the length of time the OSD will remain active
after the last time you pressed a button.
Toggle the joystick up or down to adjust the slider in
1 second increments, from 5 to 60 seconds.
Reset Menu Press the joystick to reset all settings under the
Menu menu to the factory preset values.