Confirmed content sizes
The Steam page explicitly mentions solo, five-player and ten-player content. It does not establish that every activity uses one of those sizes.
How to prepare
Use the live activity panel to confirm entry requirements, group size, reward availability and matchmaking. Group guides should identify the exact Global patch.
Why this site does not list every drop yet
A complete drop table requires current Global client evidence. Datamined or regional tables can be useful research leads but are not automatically Global facts.