YouTube in strict mode, not moderate mode

Hello,

i want to restrict YouTube in Scrict mode (and not the moderate mode) and i don't know how to do it. This is the guide i was following: https://knowledge.workspace.google.com/kb/control-youtube-content-available-to-users-for-educational-accounts-000008802.

How do i do this in Controld? From the link:

Option 1: Using DNS

Open your network's DNS settings.
Add a CNAME for the following hostnames:
    www.youtube.com
    m.youtube.com
    youtubei.googleapis.com
    youtube.googleapis.com
    www.youtube-nocookie.com
To set strict restricted access, set the CNAME value to restrict.youtube.com.
To set moderate restricted access, set the CNAME value to restrictmoderate.youtube.com.