Change the width and length of a rectangle symbol that is tilted

I apologize if this is an obvious solution, I am very new at Animate and would appreciate help.

I have a symbol that is just a simple rectangle, however it is tilted, so the box around the rectangle symbol is not lined up with the actual rectangle. 

I want to make the rectangle shorter and fatter so that it lines up with the one below it, but when I try to edit the size it skews it.

Is there a way to change the actual dimensions of a shape within a symbol? or do I have to just make sure the shape is parallel with the stage before I make it into a symbol? Thank you!