Ubuntu Dock - the bar on the left-hand side of the screen which is used to display running applications icons and access installed applications - can't be disabled using Gnome Tweaks (disabling it does nothing), but there are a few ways you can get rid of it if you need this. This article list 4 ways you can remove or disable Ubuntu Dock, as well as the drawbacks (if any) of each option, and how to undo the changes for each option. The article also includes alternative ways to access the Activities Overview / list of installed applications without Ubuntu Dock.
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