Procedure might be different for Android device. I just don't want to mess with my youtube-projector.

1. Open 1.1.1.1 app.
2. Touch the three lines at the top.
3. Touch 1.1.1.1, not 1.1.1.1 with WARP+.
4. Slide the button and connect to DNS.
5. …
6. PROFIT!

Screenshots

Touch the three line button inside small squared.

Touch 1.1.1.1. And exit the settings.

Now you can connect to Cloudflare without the VPN service.