Created attachment 140361 [details] mockup of how vertical tabs could look This is a feature request for an option to move the tab bar from the default horizontal orientation, to a vertical orientation. Attached is a mock-up of how a vertical tab list could look (shown 8 random tabs open). Motivation is similar to moving the Plasma task bar to the left or right side of the screen, or using a web browser with a vertical tab bar (e.g. Vivaldi built-in, chrome or firefox with plugins like tree-style tabs). As a multi-tab multi-window junkie, I'm willing to sacrifice horizontal space to have dozens of tabs/windows open and easily read all the titles and rearrange them. Similar requests, but different purposes: https://bugs.kde.org/show_bug.cgi?id=311580 https://bugs.kde.org/show_bug.cgi?id=306255