In Dorico Pro, bar numbers use paragraph styles so that you can use different paragraph styles in different layouts. In particular, part layouts often require differently formatted bar numbers compared to full score layouts.
By default, there are the following paragraph styles for bar numbers:
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Bar numbers (parts): Used in part layouts
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Bar numbers (score): Used in full score and custom score layouts
Initially, both paragraph styles have the same settings, but you can change the settings of each paragraph style independently. For example, you might want to use a bold italic font for bar numbers in part layouts but use a plain font with a much larger font size in full score layouts.
You can then change which paragraph style is used in each layout independently.