Override default address

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i need to display some usermeta in default address template..
according to wc docs.. the code in function.php to override and change thems looks like this

// Billing and Shipping fields on my account edit-addresses and checkout
add_filter( 'woocommerce_default_address_fields' , 'custom_override_default_address_fields' );
function custom_override_default_address_fields( $fields ) {
    $fields['first_name']['label'] = 'First name';
    $fields['last_name']['label'] = 'Last name';
    // ect ect 
    return $fields;
}

in my case this have no effect on frontend.. i can’t understand why.
im using elementor with “The7 theme”

somone can help me to solve?