Show the window size while resizing

The question "[how to know the geometry of a window, while resizing?](https://unix.stackexchange.com/questions/518589/how-to-know-the-geometry-of-a-window-while-resizing) " looked promising, but its single, accepted answer suggests to use CLI tools to resize a window to a specific size, so it's not answering my specific questions: - Using a modern issue of KDE (KDE 5 in my case), is it possible to configure the window manager so that a windowlet is shown, showing the instantaneous size (usually in pixels, in characters for XTerm and its similar) of the resizing window? - If yes, how to? --- Addendum I checked which display server the system is using: echo $XDG_SESSION_TYPE ⇒ x11. --- Using the method described in this answer I have the following window, no "Display geometry when moving or resizing" option to be clicked.