every document should have a specific Zoom configuration, because some books should have more zoom than others, for example if i open one document that reuqieres 200% zoom and then open other than requiere 100% is not confortable to change the zoom everytime i open new documents.

adobe pdf drive has this funtion and works perfectly, every document is set at 100%, but if personalize this document to 150% whan i reopened other day it opens in the personalized zoom, in you app lumin it opens in the last zoom used in the last document opened