Drag and drop
Drag and drop can be useful for rearranging the nodes in the tree. If a node has a subtree, the entire subtree will move with it.
If you click on a node and hold down the mouse button while moving the cursor to another node, the original node will become a child of the destination node.
If you hold down the shift key while you drag, the original node will become a sibling node, appearing right after the destination node.
You can also drag and drop text in the article area. Select the text you want to move by dragging with the mouse, or double click to select a whole word. Then click and hold on your selection and move it where you want.
You cannot drag and drop with the right mouse button.