Also, you need to toggle your boolean to false and true. Like this:
public function Toggle()
{
if(MainMenuON){
// if its active, then deactivate
MainMenuON = false;
MainMenu.SetActive (false);
}
else{
// if its deactivated, then activate
MainMenuON = true;
MainMenu.SetActive (true);
}
}
Then just choose this function on the inspector.
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