If you want to set different fancy heading sizes per sections, you need to set class name for each section and then use above css per individual sections. Basically, if section's class name is my-class-name, then above css need to be preceded with .my-class-name
Class name need to be set inside Custom | Classes field for the section item. If you will set such class name properly, let us know link to page where you did it so we can have a look and check if you did it properly.
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please send us link to page where you would like to make this change first.