Delete auto fill data in Acrobat

The Auto-Complete feature stores any entries that you type in an interactive form field. Auto-Complete then suggests or even automatically enters responses that match your typing in other form fields. The suggestions appear in a pop-up menu, from which you can select a match. The Auto-Complete feature is off by default, so you must enable it in the forms preferences if you want to use it.

To remove an entry from the Auto-Complete memory, such as a misspelled entry that you found and corrected later, edit the list in the preferences.

1. Go to Edit (Win), Adobe Acrobat (Mac) > Preferences
2. Select Forms on the left.
3. Click Edit Entry List under Auto-Complete.
4. In the Auto-Complete Entry List dialog box, do one of the following, and then click Yes in the confirmation dialog box:
   i) To remove all of the entries, click Remove All.
   ii) To remove some of the entries, select the entries and click Remove. (Shift-click to select multiple adjacent entries; Ctrl-click to select multiple nonadjacent entries.)
   
   

Note: When you select an option in the Auto-Complete menu, a description of how it affects the Auto-Complete behavior appears in the text area below.

For more information please check out the help page : https://helpx.adobe.com/acrobat/using/filling-pdf-forms.html#auto_complete_forms_interactive_forms_only

Regards

Amal