4. Tool Bar. The Tool Bar to the left of the loop list contains buttons that allow you to quickly select and de-selects specific loops.Among other things the tools allow you to set large blocks of loops using the highlight.
Highlighting. A Loop can be highlighted by clicking on it. You can highlight a range of items by clicking on item and then holding down the Shift and clicking on another item. This will highlight all the intervening items.
You can also hold down the Control Key and high light individual items by clicking on them. As long as the Control Key down, all the previously highlighted items will remain highlighted.
Here is a list description of each tool: