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Have you applied styles individually to these notes already? If not, you can do the same thing you did for the template with just that file.

If you have applied styles to them locally, it may or may not be easy to change. If you don't have any local styles applied to any rows (any row text, not just note text), you can select everything and do Format -> Clear Style. This will remove all local styles (anything not globally applied like at the whole document or level xxx rows level). Then you can change the style for the notes.

If you will lose styles you want to keep doing that, you'll have to remove all the local styles you've defined one at a time I think.