The top two options and the last options in the menu will alter your view of the tree. When dealing with large websites containing many files, these options will help you focus on what you are working on with less confusion.
Expand – opens the file tree to expose all the files on that level.
Collapse – closes the file tree so only the top-level folders are visible and not the files within.
Special
Maximize – expands the whole tree to reveal all the levels in the tree
Minimize – closes the whole tree so only the top level folders are visible.