You can switch which address book you are looking at to any address book, or to All Address Books.

Click on the button I point out in my screenshot below, and you will see a drop-down menu showing a list of your address books. All Address Books is at the top of the list.

Thanks for your reply Bruce. I was already aware of the selection option, but I would like, when selecting the write option that the All Address Books would openautomatically and that the personal and collected Address Books would have to be selected manually

The address book that is selected in the Contacts Sidebar when the Write window is closed is remembered next time a Write window is opened, except this doesn't apply to All Addresses. In beta versions of TB greater than 52, it's possible to define a default startup directory when Address Book is opened, including All Addresses, but at the moment the Contacts sidebar works the same. It would make more sense if it were possible to define a default startup that is either common between Address Book and Contacts sidebar, or defined for each one.