Could you provide some more information? When you do a merge in SourceTree you're creating a new commit, so when hitting "Commit" you can put whatever message you wish for the merge commit that will show in the log.
Are you saying that you can't edit the commit message when merging?
Supported Platforms macOS Sourcetree has a lot to offer and, like many developer tools, finding and using it all can be a challenge, especially for a new user. Everyone might not love ...
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