If a directory contains either a System or Hidden file, but NO Read-Only files, then the F2-Override "[Enter] retry" option does not appear.

Example:

Configure ZTree option "O" to "No"
Place just one System (not RO) file in a directory.
Do Alt-Prune.
Enter the directory name, (or "PRUNE" or "Y"), and press [Enter].
ZTree beeps, displays the error and the F2 prompt.
Cycle F2 through all four options.
"[Enter] retry" never appears, and a retry cannot be done.

- John