Does TAB not work for you to drill into a directory? I never have to use C-z in helm-find-files, just a simple `C-x f`, type a few characters, TAB expands the d

Does TAB not work for you to drill into a directory? I never have to use C-z in helm-find-files, just a simple `C-x f`, type a few characters, TAB expands the directory, and ENTER opens the file or directory.