From memory the front ones have tilt adjustment and the rear are fixed. We don't use our rear ones as they block the rear view and we hardly have anyone in the back
Ditto, we take our rear ones out when camping so it’s easier to access the boot area. We’re camping at the moment so don’t have the rears but the front ones have a button on the side for tilt adjustment as @Steve B has stated
I find that the tilting ones are very uncomfortable and push me too far forward so I have swapped the driver's side for the rear one but never use anything one the rear seats for the same reason as Steve B