In editor, you can do this to hide all Terrain objects
https://i.gyazo.com/05e65a05b71d004cfc74...b4eb98.png

How about in code, which function or how can I do the same thing in my game ? I need to this to do some debug for my non-terrain objects.

You can make these draw functions optional:
https://github.com/Esenthel/EsenthelEngi...aw.cpp#L45