What should you do to disable the new Threat Protection policy you added for testing?

To disable a newly added Threat Protection policy for testing, utilizing the 'Policy Enforced' tab is the correct course of action. The design of security policy management typically involves settings that allow administrators to enforce, enable, or disable policies based on the specific needs of the organization or the testing being carried out.

When a policy is in the 'Policy Enforced' state, it indicates that the policy is currently active and applied to the relevant endpoints. By adjusting settings within this tab, you can effectively change the policy status without removing it entirely. This approach maintains the integrity of the policy framework and allows for easy re-enablement if future testing is needed.

In contrast, simply removing the policy entirely would be an undue measure when the goal is to disable it temporarily. Accessing a nonexistent 'Policy Disabled' section also does not align with typical policy management functionalities found in security solutions. The option suggesting a 'Policy Enabled' tab is likely a misinterpretation, as that tab would usually indicate that the policy is active rather than allowing for its deactivation.