Do you mean you want to delete the policies or just reassign them? If you look under My Organization, at the policy tab, which policy is applied?
The two Host Intrusion Prevention policies without a My Default policy, IPS Rules and Trusted Applications, are called multiple-instance policies because you can assign multiple policy instances under a single policy. The policy instances are automatically combined into one effective policy.
You cant delete them but you can assign or disable it
On policy 2 section if you select break inheritance and then on the assigned policy select disable - 1.png
Also try to use the manuals