Like Dolphin is even better than Explorer, Kate is even better than Notepad++!
Kate recently opens a default start page which I now find annoying. Kate also opens all previously opened files by default.
All of these things are defaults that are easy to override but changing defaults can be annoying, especially when you have been used the previous defaults for more than a decade ...
The actions for those are called "Remove Empty Lines" and "Remove Duplicate Lines"