Hi Rahul

Instead of using this functionality you can use programs and have coursesets where one courses set needs to be completed before the other one can be completed. 

This allows greater flexibility with different logic including AND, OR, SOME , ANY 

To answer your question - the list of available courses is not editable.

Regards

Hi Rahul

Any course in Totara that has course completion criteria set will appear in this list, therefore you can't remove these.

If you don't tick the 'Select none' box, it doesn't matter, your course will still complete based on other conditions you've set e.g. activity.

Your course completion will only be dependent on other courses being completed if you select a course from this list (it will be highlighted blue). Otherwise you can pretty much ignore this condition.

(To select multiple courses from this list, hold down 'ctrl' when you click on each course)

Hope this helps

:)