Gantry 5 - Drag & Drop Menu Editor
Gantry 5 features an advanced and user friendly Menu Editor, which gives you the ability to quickly and easily add elements, such as in-line particles, managing columns etc.
The Menu Editor administrative panel takes what your CMS' built-in Menu Manager has and enables you to override it. Changes you make in this panel do not in any way affect the way the CMS handles Menu items.
Read more about how to use menu editor.