FTB and the site show in the tree view only what you enter in the fields for fiirst name and last name. You can add a prefix and a religious name, but since they are not always used or overwrite the first name, they won't appear automatically in the overview of the tree. This is also due to the Gedcom format, that only recognizes the first and last name fields.
So you can put in the first and last name the name that is used most or the one you would like to show in your tree.
Please let me know if you have any more comments or questions.