With the latest iteration of Vivaldi, you can customize not only the tab bar, but all the bars (address bar, status bar, and even the panel). Enable vertical tabs Click Tabs in the Settings sidebar and then select Left or Right to enable vertical tabs. If there's an item already on your Tab bar that you don't want, click and drag it off the Tab bar to remove it. Also: The best password managers: Expert testedYou can customize the Tab Bar to be totally empty or filled with items. If you're a themer like me, the ability to fully customize the Vivaldi Tab Bar is a big deal.