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I have a MacBook Air 2017 (Dual-Core Intel Core i5) and a Samsung curved display (34” ViewFinity Ultra WQHD High Resolution Monitor with 1000R Curvature -Model : S34A650UXN) that used to display fine using a J5 JUD380 dongle to go from the USB A from MacBook to dongle. The dongle is connected to the Samsung monitor via a HDMI cable. Before I shared screen with a 3rd party during an IT session, my screen displayed beautifully. After I ended that session, I delete the software (don't recall what it was) and maybe an additional plist file(s). Now my display is stretched with resolutions options limited at 1920x1080. I have reset the monitor 3 times, and reinstalled OS (currently Montery 12.7.5 beta) 4 times. I deleted the NMRAV. I have tried a different dongle, and tried 3 different HDMI cables. I'm out of ideas and I am NOT a techie - please help!

I have a Samsung wide screen monitor that worked with 2017 MacBook Air with intel running latest OS on beta that's available - Monterrey 12.7.4 - until I download software to share with a government entity. After removing that share screen software, I can no longer get a resolution about 1920x1080, which results in my monitor display looking stretched. I've reinstalled OS three times, set to monitor to defaults two times, and still nothing. How do I add resolution size about 1920-x1080?