The One Question at a Time setting allows you to create a survey that displays one question to submitters at a time without having to go through the trouble of adding a separate section for each question to make a standard form be multiple pages.
Creating your Survey
You can either choose to make a survey be One Question at a Time upon initial creation by choosing the specific type of "Standard Form with One Question at a Time" or you can toggle this setting on for existing forms via Form Extras within the Build tab.
When enabled, each field added into the survey will appear on a separate page one at a time without any additional setup being required.
Previewing Your Survey
You can preview your one question at a time survey by selecting the view option on the survey builder screen and selecting one of the options for the drop-down menu.
When previewing your survey you can select one of three options:
Tablet View: This view will display the survey in landscape orientation.
Mobile View: This view will display your survey in portrait orientation.
Web Browser View: This view will display your survey in a new browser window.