When you click on a schedule activity and then add it to an existing plan, ACC will automatically switch to that plan. This is fine when you're only adding one activity from the schedule to the plan (unlikely) but if you're trying to add multiple activities (more likely) to the plan, this can be very cumbersome because you need to click back and forth between the plan and schedule, scroll back down to where you were, and so forth.
If ACC simply added the schedule activity to the plan and remained on the schedule page, this would be a much better workflow.
Thanks!