Hi,
We apologize, we didn’t mean to offend you. We tried to implement the Yoast SEO breadcrumbs on a test site with a default WordPress theme (TwentyTwentyOne) , and introduced several parent categories (around 5-6 pathways) onto a post and then tried to load it on a mobile device and it was also displaying similar behavior (or it can also be viewed under the WP admin dashboard > Appearance (sidebar) > Customize > toggling to the smartphone view – https://snipboard.io/uaxfdD.jpg).
If you’ve implemented the Yoast SEO breadcrumbs, are you also seeing the same behavior upon checking the smartphone view under the Appearance > Customize section? If you toggle to the other views (tablet and desktop screen), do the breadcrumbs also adjust automatically?
It might be dependent on the theme and you might have to adjust the breadcrumb pathway or the size of the text or titles if you want it to display in fewer rows.