Since 16:9 and 21:9 took over, I've dealt with it by placing as many 'toolbars' vertically as I could. Windows taskbar, Tree-Style Tabs for Firefox, and so on.

Since 16:9 and 21:9 took over, I've dealt with it by placing as many 'toolbars' vertically as I could. Windows taskbar, Tree-Style Tabs for Firefox, and so on. I've seen some UI designers move in the same direction, e.g. Visual Studio Code with its side drawer, Edge and Firefox both putting its menus in a side panel.