Changes in Panorama default behavior in PAN-OS 8.1
Feature
Change
Templates and Template Stacks
You must assign managed devices
to a template stack instead of a template.
Templates and Template Stacks
A maximum of 8 templates can
be assigned to a template stack.
Device Groups
You can only view the template configuration
for a device group if devices in the device group, and the template,
are associated with the same template stack.