I recently bought a Joomla! 4 template (Pithech) and I'm trying to set it up.
I am not a computer professional user but I intrigue Joomla! a long time to experiment with websites.
I have 3 questions regarding the configuration of the Pitech template (and probably Joomla too!): I am attaching some screenshots to better explain the problems and I apologize for some parts in Italian, but this is the language of the web site.
#1 – User optional fields.
I want to record some extra fields in the sign up module and I have activated the user-profile plugin. The extra fields are exposed in the form but I am not able to hide the additional text in the field title: how do you do this?

#2 website mail set-up
I have configured the mail manager with php-mail and when I send a test message the username field remains unexposed (% s). Where am I wrong?

#3 SMTP mail set-up
If I try to configure the mail manager with SMTP (which I would prefer) the test message does not even start and an error message appears: in previous versions of Joomla and with different templates this worked. The google account now requires a 2-step login verification: is this the reason for the malfunction?
Attached the error message: I apologize for the Italian language in the hard copy of the forms.
Thanks for your support
Arrigo