You can enable autocomplete for form fields. If a customer who recently filled out the form comes back to the site and decides to submit it again, the fields values you select will be filled in automatically.
You should not enable autocomplete for all fields. This is a good solution for contact information, but not for the values that are constantly changing.
You can turn autofill on/off in the field settings. Click on the pencil next to the field and select the desired option.
Fields with autocomplete option are marked in blue.
