Highlight Chosen Options on a Dropdown Field

Hey there!
I’m trying to find a way to highlight the options I click on when I have a dropdown field to update/create. As for now, it doesn’t show which options I’ve already clicked, and when there are more than 3 items, it shows “4 items selected” without me knowing which ones I have chose from the list.
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Is there a way to bold/checkmark the options I choose when I click the dropdown options?

Many thanks!