DNSecure is a configuration tool of encrypted DNS for iOS/iPadOS. An encrypted DNS service you configure will be used system-wide.
Supported protocols are DNS-over-TLS and DNS-over-HTTPS.
How to use:
1. Select a DNS server you like, or add another one
2. Enable "Use This Server"
3. Open the Settings
4. Go to "General" > "VPN & Network" > "DNS"
5. "Automatic" is selected by default, so select "DNSecure"