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You can change icons by using their category
The Icon component comes in five categories
In the Category drop-down, select the category
Action: Action icons are for use with quick actions on touch-screen devices
Custom: Custom icons are for use with a very specific or unique action
Doctype: Doctype icons represent document file formats:
Standard: Standard icons represent informationare available on the desktop, by default while installing Windows OS
Utility: Utility icons are simple symbols in a single color that identify labels and actions across many form factors
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