This allows menu-select to work as mentioned in zshcompsys(1).
# COMPLETION SETTINGS
-# Use new completion system.
-autoload -U compinit && compinit
# Load the complist module which provides additions to completion lists
# (coloring, scrollable).
zmodload zsh/complist
+# Use new completion system.
+autoload -U compinit && compinit
# Make sure the list of possible completions is displayed after pressing <TAB>
# the first time.
setopt nolistambiguous