Now there is a better interface. The original configuration really gives people a headache,The modified interface is much better:

1. download this and unzip:
   修改xournalpp配置.zip

2.get 3 files:

3. findC:\Users\ here change toyour account\AppData\Local\xournalpp,Then, replace the original three files with the downloaded ones:

4. reopen your .xopp flie