Do you want to change the template of your post setup for courses and lessons? All you need is this simple plugin Custom Post Type Page Template. This plugin is out of date but still works with the current WordPress version. There is also a 50% chance this plugin will work with your theme.
Once installed and activated you will find the new tab under Settings > Custom Post Types Page Template.
Now you can select all the LearnDash related post types (start with “sfwd_”).
Note: Do NOT activate Enforcement Mode.
Once you select Save Changes you will can create a Course or Lesson in LearnDash, then there will be a drop-down menu for you to choose a possible Page template from your theme.