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The aspect ratio may be disabled due to various reasons, please check the followings.
1. Make sure the HDMI cable is currently connected with the projector and
video source.
2. Make sure the Screen Fill is NOT set to 16:10, 4:3 or 1:1, or else Aspect
Ratio will be set to Auto and not available for adjustment.
3. Make sure the Auto Screen Fit function is turned Off.
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