In brief, active system cooling policy increases the fan speed before slowing the processor, while passive system cooling policy slows the processor before accelerating the fan speed. Obviously, the latter is helpful for power saving. Thus, according to your need, you can follow the instruction below to activate or deactivate the policy in your Windows 10 PC.
Video guide on how to activate or deactivate system cooling policy in Windows 10:
Step 1: Get into Power Options.
Step 2: Click Change plan settings on the right of the selected power plan.
Step 3: Tap Change advanced power settings to continue.
Step 4: Expand Processor power management, choose System cooling policy, select Active or Passive, and hit OK to finish the setting.