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Hello @amdelellis,
Thank you for contacting Themeum support. I hope you are doing well.
You can apply CSS rule to hide this button but this is not recommended as this button is linked to course progress data. Instead, you can create quizzes and assignments at the end of each module to test them to ensure they watched video lessons or you can use “Content Drip” to compel them to watch each previous lessons before they can move on to the next. This feature doesn’t allow them to jump to any random lessons.
Should you decide you hide this button you can apply this CSS rule from WP admin dashboard > appearance > customize > additional CSS
.tutor-course-single-content-wrapper #tutor-single-entry-content .tutor-course-topic-single-header .tutor-topbar-mark-btn {
display: none;
}