Command entry: 
Slate Material Editor
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Menu bar
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Tools menu
The Tools menu toggles display of some of the Slate Material Editor interface components.
Some menu choices are also accessible from toolbar or navigation buttons, so this topic shows the button alternative along
with the menu choice.
Interface
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Material/Map Browser
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Parameter Editor
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- Navigator
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Toggles display of the Navigator. Default=on.
Keyboard shortcut: N