Board Thread:Support Requests - Community Management/@comment-31371628-20170912004437/@comment-27481640-20170912010126

Actually, it's possible to turn on a block-anonymous-users on your existing wiki, so there's no need to make a new one just for the purpose to avoid unregistered editors. Just go to your admin dashboard, click on "Wiki Features" and scroll down to the section "Require all contributors to log in". Swipe the bar to "enabled".