Ok, At long last, I have managed to work this one out for myself also. I post this here with the hope it is helpful to the community:
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Install dconf editor if you haven’t already.
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Follow the steps in the link posted above and again herebelow:
https://discourse.ubuntubudgie.org/t/nemo-icon-size-in-20-04/4947
- but then you ALSO have to go back into dconf editor, specifically into /org/nemo/preferences and turn on ‘ignore-view-metadata’.
Now your icons will all change to the zoom size you have set.