Some windows in LibreOffice are dockable, such as the Navigator window. You can move these windows, re-size them or dock them to an edge.
To dock a window, do one of the following:
Drag the window by its title bar to the side, or
Double-click inside a vacant area of the window while holding down the CommandCtrl key. In the Styles window, double-click a gray part of the window next to the icons while holding down the CommandCtrl key. Alternatively, press CommandCtrl+Shift+F10.
These methods can also be used to undock a currently docked window.
Click the button on the edge of the docked window to show or hide the docked window. The AutoHide function allows you to temporarily show a hidden window by clicking on its edge. When you click in the document, the docked window hides again.