You can't, sort of - when you create a new user, JIRA adds them to all the groups in the "can log in" groups in "global permissions". By default, that is "JIRA users".
You need a group to be able to let people log in.
So, you have to have at least one group in there for your non-admin users. And all new users will be added to it.
Standard recommendation - remove jira-users from all uses EXCEPT "can log in". Don't use it in roles, permissions, security schemes, notifications etc. Then define your other reoutes into projects as required.
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