If I want to create a new file config/initializers/NEW_FILE.rb under CTRLP,
I need to type the full path, how could I use the fuzzy search function to auto-complete the config/initializers/ in the typing area.
That is, I can type cfg/ini_ then I can type some key to auto complete config/initializers/

I know you didn't ask for that but you could do the following without CtrlP:
You'll need
longestin the values ofwildmode, though: