By default, the atom tree-view for browsing files/directories will open a file or collapse/expand a directory listing just by single-clicking on the entry.
This package changes this by forcing the user to double-click on a files. Directories can be opened by double-clicking the directory name or single-clicking the little arrow next to the directory name, as is the default behavior in most editors.
apm install dbclick-tree-view
This package is heavily inspired by the atom-double-click-tree-view and atom-double-click-tree-view packages. So a huge shout out to them.