UGEE M808 - Page 22

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Set Screen Area:
You can manually select the working area of the screen according to the prompts
from the bottom of the computer monitor. For details, see the Screen Area Selection
setting in 6.3.1.1.
Rotation settings:
You can set the device to 0°, 90°, 180° or 270°. Rotate the device to the
corresponding direction after setting rotation.