sorry for the delay.
that didn't change anything, no interactive menu completion is offered,
just the prompt:
zsh: do you wish to see all 164 possibilities (41 lines)?

and then tabbing again the list of possible options is printed

Pier Paolo Grassi
linkedin: https://www.linkedin.com/in/pier-paolo-grassi-19300217
founder: https://www.meetup.com/it-IT/Machine-Learning-TO


Il giorno mar 12 mag 2020 alle ore 02:39 Jun T <takimoto-j@kba.biglobe.ne.jp>
ha scritto:

>
> > 2020/05/10 3:23, Pier Paolo Grassi <pierpaolog@gmail.com> wrote:
> >
> > thanks, but it didn't make any difference
>
> Please try:
>
> zsh -f
> zmodload zsh/complist
> autoload -Uz compinit
> compinit
> zstyle ':completion:*' menu on select=2
> grep -<TAB>
>
>
>
>