When a database is created, Administrator is set for the user name who create database in ACL
And there are no option to set another access right(e.g. Designer or Editor) for database creator.
Request new function or setting that control ACL for database creators when a database is created on Domino Servers.
(In addition, when non-Administrator right in ACL is set for the database creator, Administrator right in ACL should be set for another user instead (e.g. a user set as administrator in server doc or another way.))