I found that fzf-tab serves the purpose of Git completions much better. You can read up more on how to use fzf-tab and other completions in this article
Git completions, powered by fzf
Make sure you have fzf installed. Then use the plugin manager of your choice to install fzf-git.
zplug "hschne/fzf-git"
antigen bundle hschne/fzf-git
git clone https://github.com/hschne/fzf-git ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/fzf-git
This plugin simply enables auto-completion of git commands using the ** trigger. For example, type
git checkout **<TAB>
to get a fuzzy-searchable list of branches. Currently only git checkout and its aliases (git co, gco, g checkout, g co) are supported.