It would be much more useful if there was a way to lock and unlock the 2 proofs that allowed one to reposition each proof and then scroll in tandem after locking (an example would be if a page was deleted, so you need to compare page 7 to page 6). Currently when you switch on “sync scroll”, the proofs automatically align generically. Also you cannot have one zoomed in (sometimes the size/format changes from the back up)…
