“Do you need anything else?” “No, thanks, that's all.”“您还需要别的什么吗？”“不，谢谢，就这样。”

They're (just) different, that's all. [=I am not saying anything more than that they are different]他们（就是）不同，不用说了。

I went there to visit friends and that's all. [=that is all I wanted to do there]我去那里就是看望朋友，仅此而已。