When you show column in NAV not all fields are available. About this page will show you all fields available on a page.
In NAV 2013 this can be located from Microsoft Dynamics NAV icon>Help>About This Page
The screenshot below is an example of a sales order, all the fields available on the sales order header will appear under Table Fields when selecting about this page:
If you want to see fields from the sales order lines, place your cursor on the line of the sales order you want to view then use the shortcut option (Ctrl + Alt + F1).
In RTC from version NAV 2009 SP1 onwards the zoom function is available from Help about this Page. Classic client users will know this as the Tools>Zoom feature for Ctrl+F8.