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Glad to help. The fancy select fields for categories and tags are provided by a script called Chosen.js. It works great for many themes but not all. For themes where the Chosen styles are not working well, you can disable it by adding the following snippet:
<script>var usp_disable_chosen = true;</script>Then the normal/default select fields will display instead of the fancy ones, and should be easier to style, etc.
I hope this helps, let me know if I can provide any further information.