Strange, I've not seen the first row being cut off like that. I tried when using Chinese. Can you scroll up to fix it? I can't see the right edge of the dopesheet, so can't tell if there is a scrollbar.
奇怪，我没见过第一行被切掉这样的。我用中文的时候试过。能不能向上滚动来解决？我看不到dopesheet的右边缘，所以无法判断是否有滚动条。

If I understand, the problem was fixed after reinstallation? That is also very strange. Reinstall should not affect this! I'm glad it is working for you now.
如果我理解的话，重装后问题就解决了？这也很奇怪。重装应该不会影响这个问题! 很高兴现在对你有用了。