Created attachment 198095 [details] Screenshot of Calc window So, I just opened a Calc document, and magically - the sidebar, and the sidebar deck selector, were detached, in a non-model window of their own, on top of the middle of my Calc window. Huh? ... I definitely did not do this in previous sessions. I don't understand how this happens :-(
Have you tried the "hamburger menu" (the icon with three horizontal lines at the top-right of your detached sidebar window) and the "Dock" entry? The most likely reason is that you accidentally triggered the keyboard shortcut (Ctrl+Shift+F10 by default).
(In reply to Ming Hua from comment #1) > Have you tried the "hamburger menu" (the icon with three horizontal lines at > the top-right of your detached sidebar window) and the "Dock" entry? Yes, and that works. > The most likely reason is that you accidentally triggered the keyboard > shortcut (Ctrl+Shift+F10 by default). I am 100% certain I did not press anything like that; plus, the undocked state was what I got when starting the app - without pressing any keys. I just double-clicked a Calc document.