How to activate feature “Stop user enumeration”

On the plugin’s www.remarpro.com description, the exact feature I’m looking for is described:
“Stop user enumeration. So users/bots cannot discover user info via author permalink”

I am clicking through all of the 14 settings screens and am not finding this anywhere yet, also the word enumeration does not come up in search results on your website where I thought it might be explained (https://www.tipsandtricks-hq.com/wordpress-security-and-firewall-plugin search at bottom).

How do I turn on that feature to hide the username when visiting a link with /?author=1

Thank you!