Command entry: 
(Material Editor): Compact
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Show Shaded/Realistic Material in Viewport flyout
Command entry:(Slate Material Editor: Toolbar
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Show Shaded/Realistic Map in Viewport flyout.)
This control lets you switch between displaying maps as shaded (Phong) or realistic (full detail) in viewports/
The control for showing maps in viewports is a flyout with four possible states:
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Uses the Shaded style and disables viewport display of all maps for the active material.
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Uses the Shaded style and enables viewport display of all maps for the active material.
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Uses the Realistic style and disables viewport display of all maps for the active material.
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Uses the Realistic style and enables viewport display of all maps for the active material.
For details, see Viewport Display of Materials .