Please disable the Freesync Premium function on the monitor, as this feature forces any resolution image signal to enter full-screen mode. After disabling it, the monitor will automatically adjust based on the input signal's aspect ratio. The aspect ratio options (21:9 or 4:3) in the monitor menu are for manual adjustment. If the PC's output signal aspect ratio is not 21:9 or 4:3, it may cause image stretching. It's recommended to set the monitor's aspect ratio menu to "Auto".
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