according your suggestion, I also checked the "Joomla Pages Menu item" in the official T3 Demo page, and I see that it is shown in the same way, without any expansion.
But collapse menu in the previous T3 blank template with Bootstrap 2 were structured to show all submenus: see our home page http://www.con-vivium.com/ and resize it as a small device.
How to show the full navigation in smal devices with T3 BS3 Blank Template?
A template without full navigation is unusable.
Thank you in advance.
Thank you for your answer.
But I've already enabled the collapse function, without results.
Please see the official T3 Demo page at http://demo.t3-framework.org/joomla30/index.php/en/
Typography menu has a submenu.
Try to resize the page as a small device and see how the submenu doesn't expand after the collapse.