ユーザー承認を管理者に限定する設定はありますか?

Is there a setting that allows only admins to approve user signups?

「いいね!」 2

/admin/site_settings/
Search in settings must approve users

「いいね!」 1

I’m curious about the ability to add only admins, not moderators.

I assume you mean moderators? Admins and moderators are ‘staff’ so they can approve users if needs be.

  1. Ask your moderators not to approve users

  2. Make them category moderators

  3. Revoke their moderation privilege and grant them TL4 (leader)

「いいね!」 3

Yes, operator mean is moderator