There is no fold visible from the other side and it can't have been moved because the small blood spot on Sheila's arm is still inline with the drop on the note.
The folding is evident if you look very carefully but because this photo was taken right on top you can't see as good as you would if taken further away to show the entire side.
The significance of the fold is that the part touching the floor (and thus toughing the bloodstain) is the left page instead of right. If it was just folded nicely in half then the right side would be touching the blood. I am referring to the sides while it is upside down not facing us.
While some would love to say it is a palm print and therefore the killer had to have touched it and this proves Sheila was not the killer it is not aplam print it is just from sitting in the pool of blood.
Why it was folded over instead of nicely cracked in half is what makes little sense. I don't know what Jeremy was thinking. Harters thinks the dorr pushed it against her and it had actually been further away from her. In any event it should have been much lower if wanting to pretned she looked at it before shooting herself, she didn't kill herself lying down.