XenDesktop 7.6 Multiple Screen with Desktop Viewer

By default when Desktop Viewer is enabled, it does not span on multiple screen. When it is maximizes, it only maximizes on one screen. To have it utilizes multiple screen, do:

Enable Desktop Viewer
Login to your StoreFront Server
Navigate to C:\inetpub\wwwroot\Citrix\<your store or receiver web>\
Edit web.config
Find showDesktopViewer="true" and make sure the value is true, not false

Enable Force Full Screen
Login to your StoreFront Server
Navigate to C:\inetpub\wwwroot\Citrix\<your store>\App_Data\
Edit default.ica
Find [Application] 
Add DesktopViewer-ForceFullScreenStartup=true under that tag

Propagate your change across your  Server Group