The material on the right is golden but the cube is not.
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$\begingroup$ I pressed on TAB to change to edit mode then I clicked on the right in the material on select and then on assign but then when changing back to object mode I see that no changes have been made. The cube still gray and not golden like in the preview. $\endgroup$ – Daniel Lip Sep 11 '19 at 22:16
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$\begingroup$ The material only takes effect in rendered mode. Try rendering your cube to see the material $\endgroup$ – person132 Sep 11 '19 at 23:23