Loop through files in subdirectories batch file

I am trying to loop through a bunch of files in sub-directories to run a command on them, but I can't seem to figure out how to reach them.

The directory structure is like this:

- Main directory (Holds .bat file and top-level directories)
- Sub-directory
- Search directory
- A bunch of files (I need the locations of all of these separately)

I am able to get a list of all of the files/folders in the "Main directory" using:

for /f %%f in ('dir /b /r *') do echo %%f

but I cannot seem to figure out how to go any further into the directories to get the files in the "Search" directory.

An example of the file structure is:

C:\Users\swiftsly\Search160\0002\search\AP584.txt

Any help is greatly appreciated!

The final solution to this question, with the help of the recommendation by Squashman to use `/R` instead of `/f` is:

@echo off
for /R %%f in (*.txt) do echo %%f

This will print out a list of all of the .txt files in the sub-directories.