Brume 2 - how to change the DNS servers?

Hello
I am using Brume 2 as a main router with public ip address.
I receive the public ip address from the ISP through DHCP.
I would like to change DNS server 1 and DNS server 2, however the editboxes are grayed.
How can I do this?

Thanks

Thank you
Will this configuration also influence the VPN clients when Brume2 is Wireguard server?
Or setting explicit DNS in the client configuration file is still needed?

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It can. Try enabling DNS Rebinding Attack Protect & Override DNS Settings for All Clients (GL GUI → Network → DNS) &/or strike the VPN providers DNS IPs from their related conf files/settings. Test via: