Hi David,

Yes, in 2021 version PDF option was removed from EXPORT command dialog.
If you want to export multiple layouts from drawing to PDF, you van use Batch Publish feature - PUBLISH command:
https://help.autodesk.com/view/ACDMAC/2021/ENU/index.html?guid=GUID-BBBA8D8F-7C3C-4A8D-A581-9223D961...
https://help.autodesk.com/view/ACDMAC/2021/ENU/index.html?guid=GUID-0D1DB83F-F1A3-4D22-8FBC-342B2E93...
Menu File -> Batch Publish, or command alias - BPUB