We should be using BLAST protocol, but PCoIP is an available option for end users. When I look at the displays within the Win7 guest I see that it thinks it's extending the desktop correctly, however the iPad only shows a black screen. The guest OS we're logging into is Windows 7 SP1. Extended screens is where the problems occur. Horizon Client runs perfectly fine in single display mode on both the iPad and Macbook Pro. Videos etc work fine as well, and I believe the Pen and touch bar controls work fine (remote user, I haven't tested myself).

In this case, Sidecar seems to be working fine, as windows can be moved between the Mac's main screen and the iPad without issue.

Sidecar is a feature available on both certain models of iPad and Mac products that allow the Mac's display to be extended across to the iPad. I've run into a possible compatibility issue with an iPad pro running in Sidecar mode with a brand new Macbook Pro.