Controls help

[Justforthisonequestion]

I play attack of the b team with a mac mouse and accidently switched the use item (right-click) into left click, When I do this in vanilla there always is a reset button next to it.

But in aotbt there is no reset button so it will think that I wanna chance the use item into either ctrl or left-click, I am unable to reset it for as far as I know

 

So my question is: Is there anyway to reset it, and if yes how?