The option is no longer part of Raspi-config. Even on the official Pi forums, they make it sound impossible to set a static IP in bookworm, and go as far as saying to use your router to confine it to one address. While this works, it is not a fit all solution, certainly not for me, which is why I spent a couple days trying find an answer.
The answer is 5 letters at the command prompt........ nmtui This gets you part of the Network Manager, the part that lets you set a static IP on both the wired, and the wireless interfaces of your headless RPi.
Hope this helps someone!!
