Is it possible to hide the "Listening..." popup that appears after "OK Google"? It would be extremely helpful if I could say "OK Google" and issue voice commands without my screen being almost entirely covered by the white "Listening..." pop up.
There are ways to achieve that:


Using Google search widget


If you have a Google widget, simply tap the mic and say "Okay Google, the window that appears is not covering whole scren but its almost half:






Customising window with third-party tool (XHalo floating module)


Good news is if you have root (and additionally Xposed framework), you can install the XHaloFloatingWindow, pin the Google to Status bar and launch it fron there with a small sized window as shown: