Using the Active Connect setting in Map Pilot will ensure that all images are taken while travelling the same speed. The flight outside of the defined area is used to speed up and slow down for the turn arounds. The faster you travel, the more room you will need to speed up and slow down.
Think of the orange survey boundary area as the are in which the data will actually be accurate. Using the Connectionless mode, imagery will be taken outside this boundary but you should think twice about using it for any volume related calculations since the images taken at slower speeds will affect the accuracy of the final product.
The path that gets designed is the path that gets flown so the pilot needs to make sure that path is a safe one.