Vi

• sudo update-alternatives --config editor
• sudo update-alternatives --config vi

• set -o vi

See also

• sudo, visudo, su, passwd, sudo su, Passwordless sudo, /etc/sudoers, /etc/sudoers.d/, /etc/sudoers, sudo --help

https://vim.fandom.com/wiki/Set_Vim_as_your_default_editor_for_Unix