I think this is just a misunderstanding about File/Open option. This will just open the repo, it does not add it as a bookmark.
To do that open the 'New Repo' tab using the + in the tab header. Then select the 'Add' option and open your repo in there. You can add a bookmark name and optionally folder it.
After adding it there you will be able to search for it in the 'Local' list.
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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