Regardless of the display protocol, you can use multiple monitors with a remote desktop.
If you are using All Monitors display mode and click the Minimize button, if you then maximize the window, the window will go back to All Monitors mode. Similarly, if you are using Fullscreen mode and minimize the window, when you maximize the window, the window will go back to Fullscreen mode on one monitor.
Using All Monitors for Horizon Client
If you have Horizon Client use all monitors, if you maximize an application window, the window expands to the full screen of only the monitor that contains it.
Horizon Client supports the following monitor configurations:
If you use 2 monitors, the monitors are not required to be in the same mode. For example, if you are using a laptop connected to an external monitor, the external monitor can be in portrait mode or landscape mode.
If you use more than 2 monitors, the monitors must be in the same mode and have the same screen resolution. That is, if you use 3 monitors, all 3 monitors must be in either portrait mode or landscape mode and must use the same screen resolution.
Monitors can be placed side by side, stacked 2 by 2, or vertically stacked only if you are using 2 monitors and the total height is less than 4096 pixels.
To use the 3D rendering feature, you must use the PCoIP display protocol. You can use up to 2 monitors, with a resolution of up to 1920 X 1200. For a resolution of 4K (3840 X 2160), only one monitor is supported.
With Horizon Client 3.4 or earlier and PCoIP, the maximum number of monitors that you can use to display a remote desktop is 4, with a resolution of up to 2560 X 1600 if you have enough video RAM.
With Horizon Client 3.5 and PCoIP, a remote desktop screen resolution of 4K (3840 x 2160) is supported. The number of 4K displays that are supported depends on the hardware version of the desktop virtual machine and the Windows version.
Number of 4K Displays Supported
10 (ESXi 5.5.x compatible)
7, 8, 8.x, 10
11 (ESXi 6.0 compatible)
7 (3D rendering feature disabled; Windows Aero disabled)
7 (3D rendering feature enabled)
8, 8.x, 10
When the remote desktop screen resolution is set to 3840 x 2160 (4K), items on the screen might appear smaller, and you might not be able to use the Screen Resolution dialog box in the remote desktop to make text and other items larger.
If you use Microsoft RDP 7, the maximum number of monitors that you can use to display a remote desktop is 16.
If you use Microsoft RDP display protocol, you must have Microsoft Remote Desktop Connection (RDC) 6.0 or higher installed in the remote desktop.
Using One Monitor in a Multiple-Monitor Setup
If you have multiple monitors but want Horizon Client to use only one of them, after client installation, you can select to have a desktop window launch in any mode other than All Monitors. By default, the window is launched on the primary monitor.