This feature allows you to not show classes online. You might have classes that you will register in-house only, possibly classes that you want to have available for attendance and record keeping/reporting, but you don't want to allow the general public to register for these classes online. This feature gives you more flexibility in terms of showing or not showing classes for online registration while still keeping the course group and other classes within that course group posted for online registration.
The default will be to show classes online, but if for any reason you choose to not have your classes available for online registration, this will allow you to do so.
While editing an existing class or creating a new class, look for the Show Online box. To not show a class online, remove the tick from this box and save changes.