For Breadcrumbs, theme settings available at
Customizer -> V3 control panel -> Post Settings
To test your rich snippets use official tool https://search.google.com/test/rich-results/
Currently, your site shows Valid in the Google test.
Unfortunately, if you are selecting Schema based breadcrumbs, it is how it will look otherwise Schema fails.
If the theme bundled breadcrumb doesn’t suit you, you may also try other breadcrumbs for eg. the breadcrumbs available in the Yoast SEO plugin.