Way again in October 2020, Microsoft introduced vertical tabs to Edge developer variations. The tabs are organized on the left facet of the display screen somewhat than the highest, in idea permitting extra of the title to be seen.
So far nevertheless it has not been doable to resize the tabs and modify simply how a lot horizontal display screen house you wish to dedicate to tab titles.
In the most recent Edge Canary Update, nevertheless (model 90.0.810.0) now you can simply modify the width of the vertical tabs from icon-only to the total internet web page title.
Vertical tabs are presently solely accessible in Edge Canary and Edge Dev. It is just not identified when Microsoft intends to roll it out extra extensively.
Thanks, Leo Varela for the tip.