You should use main function 5 to plot isosurface map of ELF, see examples in Section 4.5 of Multiwfn manual.
Respected Sir..I am first time user in Multiwfn..While plotting ELF plane map, certain ring systems and certain atoms of my molecule is not showing properly..Like it is looking as a 2D diagram..How can I get ELF plot for my whole molecule..please help..