How to change or remove anonymous account ?
Users cannot log in as anonymous it is only used by the framework as
anonymous representation of non-logged-in user. You cannot remove anonymous user since it is used for all the non-authenticated states in CUBA: login window / REST anonymous user. For REST it should be enabled explicitly thus there is no anonymous access to your system unless you enable it in application properties.
You can only rename it in the database and change
cuba.anonymousLogin to the new login.
Thanks you for your support.