Why do I lose some file options in the top menu bar?

When I sign into adobe acrobat cloud - it will provide me with options for files, send, fill & sign, but also combine files, etc.

A few times it has reset and all of a sudden I lose the options at the top to create pdfs, combine files - and will only allow me to see the options for files, send, fill & sign (when what I really need to do is combine a file or create a pdf). Am I doing something to lose or hide the menu options? How do I get them back? Thanks!