When a node is selected in the View, it shows a white border and the background, including the title bar, is darker. When it is not selected, the border is gray and the background is lighter.
To select a node, make sure the Select tool is active, then click the node. To select multiple nodes, use Ctrl+click (Alt+click removes a node from the current selection), or drag a selection rectangle around the nodes. The Select menu has options for modifying the current selection.
To deselect nodes, make sure the Select tool is active, then click a blank area of the View.
Dragging a selected node moves it in the View.
Shift + dragging a node clones that node. Ctrl+Shift + dragging a node clones the node and all the node’s children. These cloning methods also work for multiple selections.
You can use these options to move nodes and lay them out:
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Move Children (Options menu 
Move Children) When this is on, moving a node moves its child nodes along with it. When it is off, moving a node moves only that node. Temporary shortcut: Ctrl+Alt+drag moves a node with its children, but doesn’t turn on the Move Children toggle.
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Layout All - Vertical and Layout All - Horizontal (View menu Lay Out All) Arrange all nodes in an automatic layout, along either a vertical or a horizontal axis. -
Layout Children (View menu Lay Out Children) Automatically lays out the children of the selected node.