At the bottom, hit Connect to a Wireless Display. Then, from your main machine - the one you are projecting from - just hit Windows Key+P, like you were projecting to a projector or second display. On the machine you want to use as a second monitor, head over to Settings | System | Projecting to this PC and set it up as you like, considering convenience vs. Use your second laptop as a second monitor

I had this functionality all the time, built in. Why do I lug this extra LCD around? Madness. I usually travel with a main laptop and a backup laptop anyway. I've also used Duet Display and used my iPad Pro as a second monitor. In fact, I'm literally sitting here in a hotel with a separate USB3 LCD display panel to use as a second monitor. Now, I consider myself a bit of a Windows Productivity Tips Gourmand, and while I was aware of Miracast and the general idea of a Wireless Display, I didn't realize that it worked this well and that it was built into Windows 10. Then, without any ceremony, he proceeded to do this: James Clarke from the Windows team rolled into a meeting today with two Surfaces.but one had no keyboard.

Dell miracast windows 10