You can find the menu on the printer's control panel below.
Settings > General Settings > Fax Settings > Receive Settings > Fax Output Settings
On the Web Config screen, you can find the menu below.
Fax tab > Fax Output.
Saves received faxes to the printer's Inbox. Up to 100 documents can be saved. Note that saving 100 documents may not be possible depending on the usage conditions such as the file size of saved documents, and using of multiple fax saving features at a time.
Though the received faxes are not automatically printed, you can view them on the printer's screen and print only the ones you need.
You can select the operation to print the received fax or refuse to receive it when the Inbox memory is full.
Password protects the Inbox to restrict users from viewing received faxes. Select Change to change the password, and select Reset to cancel password protection. When changing or resetting the password, you need the current password.
You cannot set a password when Options when memory is full has been set to Receive and print faxes.
Saves received faxes as PDF files on a computer connected to the printer. You can only set this to Yes by using the FAX Utility (application). You cannot enable this from printer's control panel. Install the FAX Utility on the computer in advance. After setting this to Yes, you can change this to Yes and Print from the printer's control panel.
Saves received faxes as PDF files to an external memory device connected to the printer. Selecting Yes and Print prints received faxes while saving them to the memory device.
Received documents are saved in the printer's memory temporarily before the documents are saved in the memory device connected to the printer. Because a memory full error disables sending and receiving faxes, keep the memory device connected to the printer.