LearnDash sample lessons allow users a preview of course materials without being registered in that course. Sample lessons are identified as a hyperlink which can sometimes look too subtle.
The Sample Lesson Label module improves upon the LearnDash sample lesson presentation by adding a highly visible label to sample lessons.
You can even customize the Sample Lesson Labels text and colours to better suit your course design. This is done in the module’s Settings window.
Visit the knowledge base for full details on the Sample Lesson Label module.