I’m using 2d rigid body’s in my game and although rotation isn’t currently a problem, I could see it be for the players. Is there any way I can turn off all rotation for my 2d rigidbodys? Thanks! 
There is a checkbox in the RigidBody2D Fixed Angle. This stops it from rotating. I left this here in case anyone else finds this.
Yes there is!!
go to your rigidbody component → constraints, and mark free rotation: x,y,z and it will stop your 2d thing from rotating.
I can only type numbers in my constrainsts box, any help what to do with it?