The navigation status bar and the items in the View > Pages menu are available only if the Multipage document checkbox is set in File>Multipage Settings dialog box.
The status bar contains information about the current page number in a text field and the number of all pages on a label.
It also contains a collection of buttons to aid your quick navigation in the document. You can go the first , previous, next , and last page using them.
Alternatively, you can go directly to a specific page by entering a number in the current page field and pressing enter.
All the navigation possibilities: go to first, previous, next, last, specific pages are available from the View > Pages menu as well.
In addition, some automatic page zooming functions are also available in this menu, such as:
View > Pages > Fit page height adjusts the height of the current page to the height of the canvas.
View > Pages > Fit page width adjusts the width of the current page to the width of the canvas.
View > Pages > Fit page adjusts the height and/or the width of the current page to see the whole page, and places it centralized within the canvas.