It is very easy to rename a branch in Bitbucket via SourceTree. Here’s a quick guide on how to do it:
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Head over to the left-side panel, then click 'Branches'.

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After that, find and right-click the specific branch you wish to rename.

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Select 'Rename' from the list of options.

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Next, tap the 'New Branch Name' input field and enter your preferred branch name.

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Once done, tap 'OK' to proceed.

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After completing these steps, the existing name of the selected branch will be updated accordingly.
