add com.android.chrome|*|53 to your Blacklist as a firewall rule. This will enable domain blocking to work in Chrome. Toggle firewall rules off and on again for changes to take effect.
If you’re using the latest version of Samsung Internet that come with Android Pie (version 9+)
add com.sec.android.app.sbrowser|*|53 to your Blacklist as a firewall rule. This will enable domain blocking to work in newest versions of Samsung Internet. Toggle firewall rules off and on again for changes to take effect.