Tree-view responds only to double clicks for all operations. On directories, the arrow next to the directory responds to single clicks.
double-click-tree-view package for atom editor
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 allows the user to choose single or double click on a file to open it, or on a directory to expand/collapse it. This effectively turns a single-click into just selecting the item clicked on, which is the default behavior in most editors.
Tips: if Allow Pending Pane Items in Settings/Core is set to false and Enable on file of this package setting is set to false, single click on file will open the file.
To install:
apm install dbclick-tree-view
Big thanks to mattsfrey and h2so5 for writing the original projects that this has been forked from.
https://github.com/h2so5/atom-chary-tree-view
https://github.com/mattsfrey/atom-double-click-tree-view