Firewall rule to block direct traffic on the site

How can I make rule, which will detect just direct traffic?

That’d be “Referrer” equals Blank ("")


Thank you!
And if I also want to block users from specific city, not country?

That’s not possible at the moment.

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I put action Challenge Captcha, but in overview I see “managed challenge”.
How to understand phrase Managed challenge?

Also I can’t understand what the difference between Challenge captcha and Managed challenge here 2021-12-21_12-59-19.png — Yandex.Disk