Starting the game with fullscreen borderless mode, resolution 1920x 1080. Mouse pointer invisible.
Changed to Windowed borderless mode. Still invisible.
Decreased the resolution. Mouse pointer vanishing, but coming back again, when clicking outside the window and back inside the window.
Mouse pointer working perfectly under 1920 x 1080 (and probably under any other resolution), while windowed and NOT borderless.
My specs.: Win 10, Nvidia GTX 980. With overlay options available.