Just worked out that at the bottom of the styles menu you can save current styles as your default. Makes it a bit easier.


It's sort of a hassle, but copy paste a block of text with a title, subtitle, header 1,2,3,4, etc into your old doc, then one by one, select a bit of the text with the correct style, and "update Title to match", "update Header 1 to match"... And finally, select all > Format > Paragraph Styles > Options > Use my default styles.

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