help: sprites auto-resizing when playing different animations

Hi
Right now, when I drag-and-drop the sprites onto stage, they character is the same size but the actual dimentions are all slightly different because some animations require more "room" to move around. Whenenever they play, they all shrink themselves the size of the "Idle" animation.

It looks like it auto formats the size of the "Run" sprite to the same dimentions as the "Idle". Is there an option to simply turn off the way it auto sizes sprites?

Thanks for any help!