Is it possible to make the mega menu registered?

Hi There,
I want to show my mega menu only for logged in user.
When I select Joomla menu from template manager > t3_blank > navigation[tab] > navigation style = Joomla menu
and add a menu module at mainnav from module manager with the access privilege as Registered then the main menu is showing as i expected but
when I select navigation style as mega menu then there is no such option to make the whole menu as registered.
Can you help me with this issue?
Thanks