In Chrome, right click -> Inspect -> Security -> View Certificate

Thx.

But why hide it so that normal web user can't access it?

Checking what Cert-company signed the certificate is important to trust a site.

Before it was one left click and it showed the company that signed the cert (optional you could view the cert itself)

Now many steps like click on hamburger button -> More tools -> Developer Tools -> Security tab (bottom of screen) -> View Certificate (shows certificate itself)

What a trainwreck of decision t remove this vital info. e.g. YCombinator cert is from "Comodo". If it's suddenly from a funky else it would help lessen the trust.

I am sure, it was just a mistake to remove it and some cargo cult.

Must be a Chrome thing. In Firefox 54 it's three clicks: lock icon, ">", "more info". Actually the second click already gives some summary including issuer.

The browsers probably want to start relying on HTTP Public Key Pinning rather than relying on the user to verify the public key.