using sourcetree version 22.214.171.124 on windows.
Couldn't see the bookmarks on left panel. View > show/hide bookmarks options is unavailable. If its an updated UI than I request to add an option to view bookmarks on left panel.
You may want to update your documentation, then.
I don't see that when I start SourceTree and with thirty solutions to keep track of, I could really use a way to organise them.
That documentation is for the mac version.
However if you upgrade to Sourcetree for WIndows 3.1 or higher you will see there is a new project view sidebar.