TL;DR - skip to the second post if you just want to know how to convert from legacy PCI stubbing via Syslinux to the new point and click method in Unraid 6.9
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At times you will want to "hide" devices from Unraid so that they can be passed through to a VM.
Unraid Prior to 6.7
In the past (pre Unraid 6.7) we would stub the device by adding a Vendor:Device code to the vfio-pci.ids parameter in Syslinux, something like this:
append vfio-pci.ids=8086:1533
This worked