Hello,
I’ve created Blog page – https://xstore.helpscoutdocs.com/article/44-blog-page As I can see, you have posts, so a page for them is required.
About breadcrumbs – Our theme uses the page featured image as the breadcrumbs background. So, all you need is just remove the page featured image – http://prntscr.com/10oumfm
Regards
