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Deselecting nodes, when necessary, works pretty much as you would expect.
— Click once in the background of the Node Editor to deselect all nodes.
— Press Command-Shift-A to deselect all nodes.
— Command-click to deselect multiple nodes one at a time.
— Command-drag a bounding box to deselect a group of selected nodes at one time.
Loading Nodes into Viewers
Once you’ve started building a composition, the next thing you need to learn is how to view specific nodes that you want to work on. This is important because the combination of which node is being viewed and which node is currently selected (these aren’t always the same node) often determines which onscreen controls are available and how they appear.
In the following example, you’re set up to rotoscope an image using a Polygon node that’s attached to the garbage mask input of a MatteControl node which is inserting the mask as an alpha channel.
A node tree for doing a simple rotoscoping job.