I was playing around with my settings on Windows 10 and found a neat zoom trick for the girls without changing your display resolution or going into fullscreen.
Use the magnifier.
Go to settings; ease of access; magnifier. Turn the magnifier on and adjust the scale size to whatever size you want it. For best results, put the magnifier on full screen and set the mouse to follow where ever the pointer is. That way if the girls move, you can just follow where they go with your mouse.
Hope this helps for those who are looking for a way to increase their zoom size.