Hi @hife2017,

Thank you for your question.

I am not sure which category you are talking about here so could you please share me the page URL from your site where it is displaying so that i can help you to achieve it?

Best regards,
Shufflehound team

You can change its size by adding the following CSS code in the Custom CSS code option of your theme on the below path.

Admin Area -> Appearance -> Theme Settings -> Custom Code -> CSS Code

.post-categories, .post-categories a {
    font-size: 12px;
}