When you create a milestone for an epic you should be able to color code that milestone so you can tell if you are on track / at risk / on hold but there are not options to complete this function. Is there certain permission levels that are needed to in order to do this and what are they?
Also, when you mark a Milestone as "Completed" it should align to the "Due Date" you had on it or give you an option to select the "Completed" date otherwise it is not a true reflection of when it was completed. Is this something that can be made available?