Dell P2223HC 21.5" 16:9 IPS Monitor - Manual (Page 57)

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.
Language Sets the OSD display to one of the eight languages
(English, Spanish, French, German, Brazilian
Portuguese, Russian, Simplified Chinese, or
Japanese).
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 moving the joystick (min. 0 / max. 100).
Timer Sets the length of time the OSD will remain active
after the last time you pressed a button.
Move the joystick to adjust the slider in 1 second
increments, from 5 to 60 seconds.