Pet Rescue Theme Course and Lesson Sidebar Compatibility
As of March 2017, the recommend method for sidebar compatibility is to use LifterLMS Labs: Super Sidebars, a free add-on that allows you to add sidebar compatibility to just about any theme in a matter of seconds without having to write any code. See the full tutorial here.
If you’re using the Pet Rescue theme you’ll want to add the following snippet to your theme or child theme’s functions.php file in order to ensure LifterLMS Course and Lesson sidebars function correctly.