Is there anyone who knows how we can use the TAB feature like “Finder” or “Safari” and other applications in macOS Sierra?
Description from Apple about TABS:
Tabs
Get all your docs in a row.
Now its easy to keep windows from piling up on your desktop. Tabs work just as they do in Safari but now they work in most apps on your Mac, and in many third-party apps as well. Just update to macOS Sierra and your apps are good to go. Breeze between multiple Pages documents in full screen. And look at lots of different destinations in Maps without getting lost.