To access this new interface, in the Surveys & Forms tool, click on Add Survey and provide the details for a new survey as described in the article on Add Survey. Once you save this new survey details you will be presented with an option to use the new survey builder UI, to create your survey questions as shown below:

Clicking on TRY IT, will display the new survey builder as shown: 

There are detailed articles on all the new features of this survey builder:

Changes to the survey are now automatically saved, so once all the questions are created you can go to preview and test your survey.

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