There is currently no possibilty to query a collection of an Online Archive via the Web UI of Atlas. This is only possible for the "normal" collections.
It would be great if it would be possible to also query Online Archivce collections similar.

This is related to the request of https://feedback.mongodb.com/forums/924277-data-federation-and-data-lake/suggestions/40949902-access-online-archive-in-customer-data-lake