Fix External Monitor Resolution on MacBook Pro with Retina Display
QuickTime Screen Recording: How to Stop Lags and Reduce File Size
Mac] This is how you change your 49-inch display to full resolution on MacOS: Settings --> Monitors --> Displays --> click the option below ("Skaliert" in German) while holding the "option key" -->
Resolution of screenshot is off - Apple Community
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Adjust your display resolution (including HDMI, DisplayPort, DVI and VGA output) – CalDigit
How to change aspect ratio on Mac screen | Macworld