How to modify the "automatically selected" User Name field when creating a new form

Hello mcm30114​! 👋

Thanks for reaching out! You can choose which email address is selected by configuring your default identity in the app: Choose your default identity and credit card items

Alternatively, you can turn off the prefilling of usernames in the app: 

1. Open and unlock 1Password for Mac.
2. Click on 1Password next to the  in the menu bar.
3. Click Settings.
4. Turn off "Prefill username when creating a new login". 

I hope that helps. 

-Dave