Is there a command to undo git flow init?

After git flow init, how to remove the git flow model?
How do I remove all related config from the .git/config file?

$ git flow init
# force reset
$ git flow init -f

How to remove below content from the .git/config file?

[gitflow "branch"]
    master = master
    develop = develop
[gitflow "prefix"]
    feature = feature/
    release = release/
    hotfix = hotfix/
    support = support/
    versiontag = 

You can do what @Peter said from the command line too!

Those commands remove all the sections of the git config file related to gitflow.

git config --remove-section "gitflow.path"
git config --remove-section "gitflow.prefix"
git config --remove-section "gitflow.branch"

Then you can re-init gitflow as usual.

git flow init

If you removed those sections from your config any reference to git-flow is gone.

There isn't really a need to remove anything though, the git-flow model is just that, it's a model. You can always use standard git commands.

What git-flow adds to your config, only git-flow software will use, not the git itself.