From the Gentoo Linux 2007.0 x86 Networkless Handbook (4. Using the Dialog based Gentoo Linux Installer):
There is detailed help available for each step of installation at the top of the screen. We recommend that you always read the help provided before making your choices. Note that at any time during the installation process, you can save your configuration progr
The top of my ncurses screen shows "Gentoo Linux Installer" with a line inder it. No way to tab or arrow anywhere but the basic options in the middle. F1 does nothing but make the screen flash for a brief second.

What am I missing? Is the "detailed help" the few sentences in the middle box?