Customizing Menu to make visited slides more visible

Hi, my users would like to see a check mark appear adjacent to the slides they've completed in a course. Instead of creating a customized navigation (which would be time consuming) I'd like to use the default Menu already provided in Storyline. However, visited slides in the menu are difficult to discern from ones that have not yet been visited. Instead of just changing the color of visited slides in the Menu, is it possible to add a check mark adjacent to those slides or is there some other work-around for achieving this result?

Thank you

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