Question

explain channels and undo history dialogs ​

Answer 1

Explanation:

The Undo History dialog is a dockable dialog; see the section on Dialogs and Docking for help on manipulating it. It can be activated in several ways: ... From the Toolbox menu: File → Dialogs → Create New Dock → Layers, Channels, and Paths.

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Answer 2

Explanation:

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