Change the Breadcrumb Font Size.

Hi there,

I’m not able to font the any class or anything to change the CSS.

Unfortunately, Yoast doesn't add the necessary classes to make this easy.

I would say the best way is to add it using a block element as the video demonstrates:
https://docs.generatepress.com/article/adding-breadcrumbs/

Then you can tweak the style using the container block setting that's holding the breadcrumb shortcode (also demonstrated in the video).