In Windows 10, the mouse pointer drop shadow effect is disabled by default. But fortunately, there’s a simple way to get it back. This guide will teach you how to enable the mouse pointer drop shadow effect from Windows 10's settings.
How To Enable the Mouse Pointer Drop Shadow
Right-click on Start to open the Power User menu and select the Control Panel from the list. Click on Mouse > Mouse Properties > Pointers tab and tick the Enable Pointer Shadow checkbox. Click on Apply > OK: