This screen prompts you with:
Do you wish to configure X at this time? [1] 1) yes 2) no >
if you have installed the X Windows package group. The default is "1" (yes), but you can run the "Xconfigurator" program (in the /usr/X11R6/bin/ directory) at a later time if you wish to put off X configuration.
When you exit "Xconfigurator", or if you choose not to use it during installation, you will return once again to the "Installation and Configuration menu" screen.