On your recommendation, I used the CSS styles and got the result. Maybe it’s useful to someone
.uwp_form_text_row { display: none; }
.uwp_form_password_row { display: none; }
.uwp_page .uwp-login-form input { display: none; }
.uwp_page .uwp-registration-form input { display: none; }
.uwp-remember-me { display: none; }
.uwp-forgotpsw { display: none; }