There are a few caveats around changing the setup after you've started using git-flow, which is why there's no option to change it in ST right now.
If it's just the prefixes (not master or develop) you want to change, it's a little less tricky, unless you already have feature / release / hotfix branches. You should not change the prefixes if you have any of these already.
If you don't, then you can edit the prefixes in the .git/config file inside your repo. Look for the section marked [gitflow "prefix"], and modify the values on the right hand side to change them. Make sure you keep the '/' on the end.
Supported Platforms macOS Windows To make using Sourcetree as simple yet powerful as possible we embed (bundle) dependencies such as Git, Git LFS, and Mercurial. We strive to keep these...
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