I'd like to dock the "identify" window to the top or bottom of the QGIS window. Docking to the left and right seems to work fine (a blue area indicates the new position of the panel after releasing the mouse button). However, when dragging the panel to the top or bottom of the window, no blue area is shown.
However, docking other panels (e.g. "View Results") to the top or bottom works? I'm using QGIS 3.2.3.