WEB FORM DETAILS: Where is the control to turn this feature on in 8.9?

@dmcghan

When you click the Edit button on an item, you'll be able to click the "+ add more" button, shown here, to add additional fields:

Then you can choose a field type, and click Save when you're done.

If you want to save additional fields when you're in the browser, here's what to do:

1. Complete the form. You can autofill some of the fields if you want. Don't submit the form.
2. When all the fields look like they should, right-click 1Password in the toolbar of your browser, and click Save Login.
3. Confirm the additional fields look correct in the pop-up window, and click Save.

There's more about this procedure here: Save and fill passwords in your browser — If you need to save additional fields on a website

Hope that helps! :)