Flat openstack network

Good day, I have a question, how to configure neutron in openstack kolla, so as not to make a vrouter but to make a flat network and pass vlans to openstack and make a public network directly in openstack kolla. at the moment I have it on vrouter but it is not a good solution for me. and I would need to set up several networks in openstack Could someone suggest where to find it and how to set it up?