The “Account name“ field supersedes the selected account in the navigation bar.
Thus, when you choose an account through this means, the other fields suggestions are automatically updated to be linked to this account (except in the fields that are already filled in).
Account A is selected in the navigation bar. Enter firstname.lastname@example.org in the email field. This value only exists in account A.
Then click on SEARCH: You get 1 result.
Now, go back to the form (by scrolling the screen up) and choose the “Account name“ field in NEW FILTER. Select account B.
Click again on SEARCH: You don’t get any result since email@example.com is a value that is not available in account B.
Go back to the form, click in the email field, then on the right cross to delete the content. Start typing “myem”: The suggestion doesn’t return any result.
The autosuggestion has been updated and the value firstname.lastname@example.org is not suggested anymore.