thank you @joeyk - your answer really made the difference . I see that you are present and answering a ton of cases !
fact it’s that I have one ecommerce site + one blog in subdomain and mautic in another subdomain.
I am collecting / poping-up forms on ecomm site and blog , focus form item from mautic subdomain.
I have read again thread of emails from https://forum.mautic.org/t/focus-item-form-modal-popup-not-closing-after-form-submission/8900
and I think that my problem it’s that I am missing mautic-form.js file . I will look further.
Once again thank you !