Expanding and Collapsing Selected Directories
By double-clicking on single directories, you can continue expanding a particular directory path name one level at a time. Other methods are available to expand all directories at once or to expand selected groups of directories.
To expand or collapse a group of directories, select them and double-click on them. Note that because double-clicking has a toggle effect, you can expand or collapse groups of directories only one level at a time. If you double-click multiple directory levels at one time, the result may be the opposite of what you expect.
To expand or collapse selected directories level by level, click on the first directory that you want to select, then continue selecting directories by shift-clicking (pressing <Shift> and clicking) on them. When you select the last directory, press <Shift> and double-click, instead of single-clicking, on it. This selects the last directory and expands or collapses all of the directories that you selected.