By default, the platform does not have this option. You can use the following CSS code to make the LearnDash breadcrumb background transparent.

Please follow the steps below:

1. Go to BuddyBoss > Theme Options

2. Under Custom Codes, enable CSS

3. Append the following:

.learndash-wrapper .ld-lesson-status{
background: transparent !important;
}

4. Save changes 

Note: Any modifications are considered as custom work already. Know more about our Support policy here: https://www.buddyboss.com/support-policy/