The action_create action contains a menu with all four "new" actions. It is inserted into the main window
        tool bar and lets the user create new items in the file tree.
        QtCreator currently does not support defining such actions that open a menu with choices, so do it in code.

def _create_action_create(self) -> QAction:
        """
        The action_create action contains a menu with all four "new" actions. It is inserted into the main window
        tool bar and lets the user create new items in the file tree.
        QtCreator currently does not support defining such actions that open a menu with choices, so do it in code.
        """
        icon = QIcon.fromTheme("document-new")
        action_create = QAction(icon, "New…", self)
        create_menu = QMenu(self)
        create_menu.insertActions(None, (  # "Insert before None", so append all items to the (empty) action list
            self.action_new_top_folder,
            self.action_new_sub_folder,
            self.action_new_phrase,
            self.action_new_script
        ))
        action_create.setMenu(create_menu)
        return action_create