Outlook files inbox lost favourites option

When updating my Microsoft Office package I lost the option of a FAVOURITE file in list of files

How do I reinstall this option in my Outlook viewing file

Are you specifically referring to the favorites in the Folder Pane in Outlook?

If you have the new Outlook, go to Settings > Mail > Folder pane and click to select "Show favorites."

Note that you won't actually see any favorites in the folder pane unless you selected some of your folders as favorites. You can right-click items and choose Add to favorites.