You can preview Draft projects by either by navigating to the dropdown of a specific project and selecting "Preview" or by selecting the option "Try Draft" while in the Editor. 

You can share preview links to your co-workers or clients for approval. All data collected while draft mode is reset once you publish the project.
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Make sure your project works and participants can click all the way through to the last page (Thank You page or Outcome page), as the participant's data is only saved when they reach the last page of the project.

We recommend to either use a Button content element on your pages for navigation, or you can set the element's click behavior to "Answering continues to next page".