To display members of a single dynamic distribution group simply run:

Get-Recipient -RecipientPreviewFilter (get-dynamicdistributiongroup ).RecipientFilter -OrganizationalUnit $_.RecipientContainer

You can also easily export members of any distribution group to a CSV file by running:

Get-Recipient -RecipientPreviewFilter (get-dynamicdistributiongroup ).RecipientFilter -OrganizationalUnit $_.RecipientContainer | Select Displayname | Export-Csv ““

Thanks,
WintelAdmin