How to add link (page links) to submenu? It only gives me the possibility to add links in the main menu, not submenu

Hi @eduardog and @touboulicaudrey ,
I face a similar issue but I 'm not sure to understand the work around

When I add the submenu … then I select the pages and click ‘‘Apply’’
I don’t have any “apply” option selection pages or sub menus… It could be great if our support team could provide more details on this? Another big pain point speaking about menus, is that changing its name will change the page title as well which is not practical