The navigation bar on the left side of view contains commands to perform actions common to most office programs.

The navigation bar on the left side of File view  contains commands to perform actions common to most office programs.

Explanation:

It enable all kinds of operations such as opening a file, closing a file, saving the file, saving a file with a different name, listing recently opened document, etc.

The open option enable us to open an existing file, all the recent files will be listed in the recent option and there are no files opened newly or if the data are cleared often, then it will be empty.

A file can be opened and saved with the different name so that the recent change will be saved in the new file and there will be presence of existing file too.