Material Design interface for Designer

We have added a new user-interface style for the Designer. In addition to the original style which we have relabeled "Classic", we have added a user-interface labeled "Material Design". The video below illustrates the differences between the Classic and Material Design user-interface styles: 

Material design style
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The new Material Design style is available immediately. Here is the documentation showing how to select the user-interface style at the account level and at the product level.