I think newer versions of Mac has ZSH pre-installed but if you installed using brew, you should be able to uninstall with brew uninstall --force zsh zsh-completions
For oh-my-zsh just delete ~/.oh-my-zsh folder
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how to uninstall in macosx
I think newer versions of Mac has ZSH pre-installed but if you installed using brew, you should be able to uninstall with
brew uninstall --force zsh zsh-completionsFor oh-my-zsh just delete
~/.oh-my-zshfolder