I need AdGuard VPN only for a few websites

Open AdGuard VPN and switch to the Exclusions tab (second tab at the bottom).

Tap Websites.

If VPN is active everywhere except for selected websites, tap Change mode and confirm the change.

If VPN is active selectively, this is what you need.

Tap Add website.

Enter the domain or subdomain name of the website (for example, google.com or mail.google.com). Note: Most popular services, such as Google or Facebook, use multiple domains. To enable VPN for a service, try adding it from our pre-selected list by clicking From list. For other websites, AdGuard VPN will be inactive.