Acer PE-S42 Series User Manual page 33

Use the up and down arrow keys to select an option, the left and right
arrow keys to adjust selected option settings, and the right arrow key to
enter a submenu for feature setting. The new settings will be saved
automatically upon exiting the menu.
5 Push the MENU button anytime to exit the menu and return to the Acer
welcome screen.
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Note: Functions vary depending on model definition.
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