where is Address Book on the Mail App?

Where is address book on the Mail app? It used to have but no more on the menu (after updated?).

When you write e-mail and go to recipient and start type, it automatically showed up some name and address but it was not correct. I want to check if the address book has the correct info. but no address book on the menu.

I tried by Thunderbird and the correct address and name showed up when I started typing. Also, I can check it via Address book it is located on the menu.

By the result, I had to create the same account under Thunderbird app.

The mail app is difficult to use for not only for the address book but also the same recipient e-mails are all corrected on 1 place and it is difficult to find which is the recent one and too many mail attached together.

This post accidentally under Apple Podcasts but it should be Apple Mail APP which I can't find as the selection