You can open multiple windows of a single document at the same time. Each window can have different view settings. For example, you can set one window highly magnified for doing close‑up work on some objects and create another window less magnified for laying out those objects on the page.
An alternative to creating multiple windows is creating multiple views. You can create and store up to 25 views for each document.
Multiple windows and multiple views differ in the following ways:
Multiple views are saved with the document, multiple windows are not.
Multiple windows can be viewed at the same time.
Multiple views can only appear at the same time if multiple windows are opened to display them in. Changing a view alters the current windows, it does not open a new one.