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I'm not sure if it's possible to use custom CSS to target a particular part of the navbar (@sticky-night-20812 / @elegant-eve-85294 have you ever seen it done?) This may not work for your particular data structure, but one way to keep a neat navbar is to use different views of data - IE in the below example I used different views of Contacts to have a dropdown nested under Contacts. (You do this via the "Duplicate view" button under Edit Layout. This is reliant on all the data for Contacts being in one table though.

You can achieve a cleaner navbar for the customer with roles. You can set which role has access to which menu item. The only downside is that admins would see all of the items at once.

Ahh, much better idea. Thanks @elegant-eve-85294 ⭐