I noticed this when booting the arch linux ISO:
- e.g. type
- then press tab
- auto-completion list pops-up below (inside red rectangle in screenshot)
- press tab tab
- use arrow keys to navigate
I installed arch linux a few years ago, I run updates regularly, I installed bash-completion, but I have not got this feature.
What's the name or how do I get this feature or how do I set it up correctly?