How to View Your Unpublished Website
You can also preview your site as a tablet or a mobile view.
Instructions
To preview your website without publishing it:
Go to Website > Edit website.
Enable the "Preview" toggle in the top right corner.
You can see the preview on the same page. To preview as a mobile/tablet device, you can switch the view in the middle of the top bar.
To go back to the editor, turn off the preview mode in the top right corner.