How to hide the menu/tool bar of gvim?
Solution 1:
Use the guioptions setting (abbreviated as go).
:set guioptions -=m
Removes the menu bar.
:set guioptions -=T
Removes the toolbar.
My reference
Solution 2:
you can hide it by typing these command in your .vimrc
set guioptions-=m "menu bar
set guioptions-=T "toolbar
set guioptions-=r "scrollbar