that's it idiom
B1 就这样，完了
used to say that something has ended
Well, that's it, we're done - we can go home now. 好啦，就这样吧，我们完工了——现在可以回家了。
That's it! I'm not listening to any more of your lies. 够了！我再也不想听你的谎言了。
B2 这就对了；正是这样
used to say that something is correct
You switch the computer on at the back. That's it. 你把计算机后面的开关打开。对，就这样。