There are two pre-set key maps available: Emacs (default) and Vi.
You can switch between them with the
keybindings built-in command.
keybindings vi keybindings emacs
In the Vi mode, you can define the displayed indicator for normal and insert modes with the following variables:
$ export VI_NORMAL = "[=] " $ export VI_INSERT = "[+] " $ keybindings vi [+] $