1. Execute the following query:
INSERT INTO `sys_objects_member_info` (`object`, `title`, `type`, `override_class_name`, `override_class_file`) VALUES
('sys_first_name', '_sys_member_info_first_name', 'name', '', ''),
('sys_first_name_last_name', '_sys_member_info_first_name_last_name', 'name', '', ''),
('sys_last_name_firs_name', '_sys_member_info_last_name_firs_name', 'name', '', '');
2. In Admin Panel > Builders > Profile Fields, drag FullName from active items to inactive items, then drag FirstName and LastName blocks from inactive items to active items for Join Form, Edit Profile (for owner and admin) and View Profile (for owner, admin and visitor)
3. Specify what you wand to display in Admin Panel > Settings > Advanced Settings > Profiles > Member Display-Name
