Recent versions of the Jet Excel add-in have included some substantial changes to the Jet ribbon.
Some items have been moved so as to provide better grouping of related items. Other (less-common) items do not display by default
You have a great deal of control over which items appear on the ribbon. Simply go to the Jet Ribbon section of the App Settings...
Place a check next to those items you do want on the ribbon and uncheck those that you do not want to see.