The Divi Breadcrumbs Module adds breadcrumb markup (in RDFa format) to the breadcrumbs it generates. This can aid SEO by allowing search engines to better understand the breadcrumbs / site structure. Search engines may optionally use this information to improve their results page listing for the page displaying the breadcrumbs.
If you wish to disable the generation of markup, you can do so using the plugin's "et_pb_dmb_breadcrumbs_schema_enabled" filter (added in version 1.1.8).
For example to disable the markup site-wide, you can use the following PHP code:
Related Post: Adding PHP to the Divi Theme