Remove a field from the profile update form but not the registration form

/**
 * This example removes a field (in this example - phone1) from
 * the user profile update. That way, the user cannot update 
 * or change this field after registration.
 */
add_filter( 'wpmem_fields', function ( $fields, $tag ) {
 
    if ( 'profile' == $tag || 'profile_dashboard' == $tag ) {
        unset( $fields['phone1'] );
    }
     
    return $fields;
}, 10, 2 );


/**
 * Same as above for several field meta keys in an array.
 */
add_filter( 'wpmem_fields', function ( $fields, $tag ) {
    
    // Only remove if we're on the profile or profile_dashboard view.
    if ( 'profile' == $tag || 'profile_dashboard' == $tag ) {
 
        // An array of field meta keys to remove.
        $remove_fields = array( 'my_field1', 'my_field2', 'my_field3' );
        
        // Loop through the array and unset the key from the $fields array.
        foreach ( $remove_fields as $remove_field ) {
            unset( $fields[ $remove_field ] );
        }
    }
     
    return $fields;
}, 10, 2 );