Keybinds on map editor

[Reddox]

Hi guys, I've been plying a lot of tm² stadium lately, and I tried building a map of my own.. The problem is I can't find the menu to reassign the binds to my controller, even tough when I press "g", it says I can... Any ideas ?

[TMarc]

Key bindings of the editor are fix, they cannot be changed afaik.