Ctrl + B
This pane shows the hierarchical tree structure of the bookmarks collection. Folders can be expanded to show subfolders. Selecting a particular folder displays its contents in the Bookmarks & Folders pane to the right.
It’s possible to both drag items from this pane as well as drop items in it. For example, a bookmark can be moved to another folder by dropping it in that folder.
Bookmarks & Folders
This pane displays the contents of the selected folder in the Folders tree to the left. In addition to the bookmark or folder’s name, its location is also displayed. The columns may be resized (by dragging the edges of the column headers), but not dragged into a different order.
Double-clicking on a bookmark navigates the current tab to that location, while double-clicking on a folder opens that folder and displays its contents.
As with the folders pane, it’s possible to both drag items from this pane as well as drop items in. This makes it possible to both move bookmarks and rearrange them.