I created a custom report for this purpose called "List of Computers in Policy X" and added a parameter where you can select the name of the policy. Here is the SQL for it:
--Computer list for Policy X
SELECT DISTINCT
PolicyItem.Name [Policy],
vc.Guid [_ItemGuid],
vc.[Name][Computer Name],
vc.[OS Name],
vc.Domain,
vc.[User] [Primary User],
( SELECT TOP 1 CC.[StartTime] FROM [evt_ns_client_config_request] CC
WHERE CC.[ResourceGuid] = vc.[Guid]
ORDER BY CC.[StartTime] DESC
) AS [Last Config Request],
VC.[IP Address],
sn1.[Manufacturer],
sn1.[Model],
ou.[Distinguished Name] as 'AD OU'
FROM vComputer vc
JOIN vPolicyAppliesToResource on vPolicyAppliesToResource.ResourceGuid = vc.guid
JOIN Item PolicyItem on PolicyItem.Guid = vPolicyAppliesToResource.PolicyGuid
LEFT JOIN vHWComputerSystem sn1 ON sn1.[_ResourceGuid] = vc.Guid
LEFT JOIN [Inv_OU_Membership] ou on ou.[_ResourceGuid] = vc.[Guid] and ou.IsDirectMember = 1
WHERE vc.[IsManaged] = 1
--AND PolicyItem.Name like '%PolicyName%'
AND PolicyItem.Name like 'Software Management Solution Plug-in Install'
ORDER BY PolicyItem.Name, vc.Name