Breadcrumb image is the background image of the breadcrumb section below the main menu.
To edit this image, pls go to Auto showroom Options > Settings / or Templates > Layout > Edit the breadcrumb section > Design Settings tab > change the background image
If you want to remove or change the black overlay color, you should look at the Overlay color option below the background image.
Edit the breadcrumb section
Change the background image and overlay color
You should edit both the layout in the Settings and templates as well. Pages on your website are assigned to a specific template, so you need to edit the corresponding one to see changes.
You should go to Pages > edit a page > on the right sidebar, you can see an option "Templaza Style"
Here you can see or choose the template style assigned to a page. If a page is not assigned to a specific template, it will be inherited the layout from the theme's Settings.