You can also reset the progress by selecting specific groups and specific courses and also if you want to reset all the group courses’ progress together.
Steps:
1- You will find the Reset by group option in your WordPress admin area navigating to the LearnDash LMS menu ➡ Reset Course Progress ➡ Reset by Group tab.

2- Select a group you would like to reset the progress for.

3- Select the Reset Type.

4- Select all the courses if you want to reset them all in one go.

5- Press Reset Now.

That’s it! ?
You just have reset the progress for the selected options.