Holographic Remoting allows you to stream your application to the device. It behaves as if it was running on the device while skipping the time-consuming build and deployment processes.
To use remoting, you must first download and install the companion HoloLens application Holographic Remoting Player, available at https://www.microsoft.com/en-us/store/p/holographic-remoting-player/9nblggh4sv40. Once installed, launch the application, where you will be presented with a screen similar to the following screenshot:
With the HoloLens running the remoting player, return to the Unity Editor and select Remote to Device from ...