It only seems to do this if the left and right are using the same print profile, ie, Normal, Fast,…
If you make changes within the profile on the left, and if the right is using the same profile, then the right will change too.
So, use two different standard profiles and change each, or:
You will need to add a new profile and use that for the left or right, or a new profile for each.
‘Add Profile’ > ‘Quickly Create’ will base the new profile on the current selected profile above.
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