How does it work?
For example, there is a form called “Test” and you’re going to add an autocomplete field to this form. You need just put the autocomplete field on the form.
When the field will be added, make double-click on it to show the field’s settings. Choose “Manually” for the “Where to Get Options?” setting and then a new setting “Enter Data for Autocomplete” will be shown. Let’s put some data into it like on the screenshot below.
Please note, there is a checkbox “Allow adding new option”, tick it to let users adding new options to Autocomplete data on the frontend.