Thunderbird Address Book
I use Thunderbird (TB) 115.13.0 64-bit on Windows 11. TB displays in 1 window with 4 tabs (Mail, calendar, address book, tasks). In the Address Book (AB) tab when I double click on a contact to edit or view it, a new window used to open. I found that most useful. For a while now, the contact opens in a pane in the address book tab: -Either a large pane to the right of the existing AB panes, requiring the TB window to be widened such that it takes up most of my 27" display (when table layout is not chosen). -Or a new pane at the bottom of the address book tab which makes a small area to edit, and a small area to view the list of contacts (when Table Layout is not chosen). Question: Can TB Contacts be configured to open a contact in a new window (or new tab) instead of a new pane in the AB tab? Thanks!!!
Opaite Mbohovái (1)
There has been a new address book with a new user interface for a number of years now. What you are referring to is, I think, the old user interface which has been retired. So no, you can not have a new window.
There is a feedback and ideas link on Thunderbird help menu to https://connect.mozilla.org where you are welcome to suggest it be reinstated. But as a peer support forum, this is not the place for requests.