Nodes can be given a title by modifying the text field.
By default, the node’s background color is defined by the user theme.
This color can be overridden by selecting a custom color in this panel.
Custom node colors can be used to provide a visual cue to help distinguish some nodes from others.
The button to the right of the checkbox lets you save colors as presets
for reusing later on (much like a palette).
Color of the node background.
Node Color Specials
This menu contains Operators for working with nodes with custom colors.
Copies the color of the Active node and applies it to all selected nodes.
The properties that are shown depend on the type of node selected,
e.g. a Mix node has different properties than a Mask node.
Sidebar region ‣ Tool
The info in this panel changes with the selected tool.
Sidebar region ‣ View
You can select the Annotate tool in the Toolbar to make annotations in the node editor.
See Annotate Tool for more info.