i did foudn a temporaly solution for acces to this page , i did copy and paste relative link ... for the
*Design Section go to => www.yourwebsite.it/your_admin_section/Design
Note : u will not find template page link
*Layout and interface page go to => www.yourwebsite.it/your_admin_section/content/edit/54
*Template page go to => www.yourwebsite.it/your_admin_section/visual/templatelist
Note : is not working like on 4.2 if u try to do an ovveride at begin system will say : no file assocation , after clean chace the new template will be applied on admin section too.