You can add a progress bar to your form in the editor under "Theme" (the drop icon top right corner of your editor).
To choose progress bar as a style for your pagination buttons, go to:
Theme → UI Elements → Pagination Buttons → Pagination Style → and choose Progress Bar.
This progress bar will indicate the progress of the submission through a paginated form. This will have no effect if your form is only a single page.
A progress bar appears differently when guided mode is enabled. The progress bar will show at the top of the form rather than within the back and next arrows.
To enable a progress bar for guided mode: