Hi dramalanguage,
Please add this line of code in wp-admin->Appearance->Customize->Custom css
.course .padder .flexslider .slides .flex-active-slide .block.courseitem .block_content .star-rating:before {display: none !important;}
please refer:http://prntscr.com/nc0xvd
Please try this, in-case of any trouble let me know i will do it for you.
Partially resolved, there are three Buddypress course widgets at https://www.dramalanguage.com/all-courses/
Date Published by order and Newly Published by order widget normally deleted white star. However, the Specific Courses by Order widget still has a white star.
https://prnt.sc/nc37oi