htop is awesome. I use it all the time to monitor all the servers I use. It was only until recently that I noticed it has some great configuration options, namely the "Tree View." This allows you to see a hierarchy of processes, which can be really helpful in finding out why certain processes are running.
I quickly realized it would be a pain to have to constantly hit F5 every time I opened the program, until I realized there was a way to make htop remember your last configuration.
What you want to do is make sure you close out of htop with F10 instead of Ctrl+C, which I normally use. You only need to use F10 when you want to save the settings, and can subsequently close out how you normally do!