Have you tried changing the settings in System Preferences - Displays, you should then have 2 window, each representing each screen and you should be able to adjust the aspect ration independently.
Excellent, thank you. Not too savvy on Mac - really appreciate your help. Enjoy Sunday
No worries :-)
@7OOx23 started
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Have you tried changing the settings in System Preferences - Displays, you should then have 2 window, each representing each screen and you should be able to adjust the aspect ration independently.