Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 54)

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Operating the monitor
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).
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.