In order to display the percentage field as a progress bar, please follow these steps:
In the Fields section of the form, click on a percent field.
Click to the Advanced section.
Turn on the Show as progress bar option.
The percent field is now be displaying as progress bar in the form.
💡Tip
The progress bar displays the percentage value. For an editable field, clicking it opens the numeric input; clicking outside the input shows the bar again. The bar can also be displayed for a read-only field, but the value cannot be edited there.

