So this is a point where 4coder is still a bit week, but it is the #1 thing that I am iterating on right now so it might be better soon.
Anyway, right now there is no option for changing the "width" of tabs, if that is what is going wrong. You can use the built in autoindentor to get it to convert everything to spaces. Other than that, there aren't many options yet, but keep your eye out for a4.0.13 where I think I will have more options for this.