From the Policies tab, click the 'Filter Policies' box and choose 'Default Policies' in the drop down menu. All of your default policies will now appear. To disable a specific policy, select it from the list by choosing 'Edit'.
Now, simply choose the option to disable the policy by turning it off. This may appear as 'Disabled' or 'None'.
Click 'Save and Apply' to complete the process and disable the policy.