Expand Branch and Collapse Branch icons:
You can create the buttons; take a look here:
HELP -> Contents -> Appendix -> Internal Commands Summary
Or online:
http://www.gpsoft.com.au/manual9/NetHelp/default.htm
And look here:
[url]Expand/Collapse Tree Button]
Single File Pane, Dual Pane Vertical, Dual Pane Horizontal, and Swap Panes:
Are already present in the default configuration 
