How to confirm if my nginx server is serving the DST ROOT X3 chain

I have sites with letsencrypt being served from nginx server.
How can I ensure that my sites are serving the cross singed chain (DST ROOT X3) .

When I access from the browser and check the chain, I am not seeing the DST ROOT anywhere.
Just seeing -> R3 -> IST ROOT X1

The cross-signed DST Root CA X3 is the default chain provided.
Unless you have done something to override the default OR you are using an O/S that ignores the provided chain and builds its' own to use (Windows!), you should be fine.

If you need to test to be sure.
openssl s_client -connect EXAMPLE.COM:443 -servername EXAMPLE.COM | head
by using SSL Labs (or those types of sites)

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