Microsoft is trying to declutter the Edge browser’s toolbar by combining functions into a single mini-menu.
The new button is called the Tab Actions Menu.
The menu consolidates 3 functions – turning on vertical tabs, re-opening recently closed tabs and adding all tabs to a new collection.
The feature is in the latest Edge Canary, but appears to be part of a controlled roll-out, with not everyone having access to the new feature.
Source: Leo Varela.