I found that in the theme settings the fields for mandatory filling are not amenable to settings. In particular, the Region and City fields are always a mandatory field, regardless of the settings, the phone field is not a mandatory field, even if it is specified as a mandatory field in the settings.

@Vlad7
In item-post.php find:
sPhone: {
change it to:
contactPhone: {

I changed as you wrote, but I didn't get the result. The phone number is still optional, despite the fact that the theme settings say to require a phone number when posting.

  <?php if(strpos($required_fields, 'phone') !== false) { ?>
        contactPhone: {
          required: true,
          minlength: 6
        },

There was one consequent bug when you used cascading locations selection.
Will be fixed soon in theme.