title: How can change the first submenu name of a menu in wordpress?
body: <p><img src="https://i.stack.imgur.com/FNyoi.png" alt="enter image description here"></p>
  
  <p>I have created a menu in wordpress dashboard using add_menu_page and a submenu under that parent menu. The green marked name came auto. I want to change it to something like All CSV. How can i do that?</p>