Not sure the downvote was called for - you didn't include that part of the UI in your screenshot, and that is a common explanation for the behavior you described.
If the search box is indeed empty, then that DOES sound like a bug, and there is nothing the users on this forum can do for you, except to direct you to file a bug report at jira.atlassian.com.
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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