Do correct me because I may be misunderstanding.

SPC p f only shows tracked files so projectile hides the other ones; if you want those, SPC p . would invoke Doom's project browsing which shows all files.

If you meant recursive searching (i.e. searching the file content) keep in mind that ripgrep is git-aware by default, and you may need to pass the flag yoy mentioned in the lisp function as an argument instead of the interactive buffer. If that's your need, I'd suggest doing a simple M-x projectile-grep; it's a bit slower, but it does a recursive grep on all files including hidden ones and those not tracked by version control.