Controls on pages serve a variety of purposes. Some controls display information on pages. This can be data from the database, static material, pictures, or the results of a C/AL expression. Container controls can contain other controls. Group controls make it easy for the developer to handle a set of contained controls as a group. A FastTabs control also makes it easy for the user to consider a set of controls as a group. The user can make all the controls on FastTabs visible or invisible by expanding or collapsing the FastTabs. The user also has the option to show or not to show a particular FastTabs as a part of the page customizing capability. The Help sections' Pages Overview and How to: Create a Page provide good background guidance on the organization of controls within page types for NAV 2017.
The following screenshot from Page Designer shows all the data controls on Page 5600 Fixed...
