Easier way to mark task as complete when you are in the project

Right now, to my knowledge, there isn't a simple way to mark a task as complete when you are in a project. In your home area there is a button to mark as done and we would love that feature when you are in the project itself. You either have to edit the task and mark as complete which, or you have to type in 100%. The way it is now creates more work to just mark something done.