You can preview your instrument as you’re building it. First make sure you save your changes by clicking on the blue checkmark circle on the upper right side of the screen. Then click the Preview button:

You will see how the Instrument will appear to a respondent, including (if configured) the options to Add Row, Repeat Question, and other specified functionality. If you set the Instrument to show Progress, you’ll see the PROGRESS box on the right-hand side, where it would appear to the respondent on each page to show them the percentage complete as calculated against all Required questions.

When you’re done, click Exit Preview in the upper-right corner.