Hello KHC,
So you configured some channels and now you want to go back to the default configuration? There isn't an option to right click on the task to change it. You will have to open a new task or modify the current task.
If you had created a task, modified it, saved it, modified it again, and wanted to go back to the first modification, you could just close MAX without saving the task. When you opened it again, the first modification would be there. Please let me know if you have any questions. Have a great day!
Sincerely,
Marni S.