While having the iPhone and Windows Legend app open, typing in one instance causes changes to be made in the other (almost) instantly as they synchronize the item’s contents.
However, the cursor position does not synchronize. If you are jumping back and forth between multiple instances, it seems natural to assume that the cursor position would synchronize as well as everything else within a Board.
If there are those that prefer the cursor not to synchronize position, perhaps this could be added as a global Preference settings for users to decide which way they would like to work for all instances.