With the release of the Battlefield 1 October Update, we removed the option for 40 player Operations. This was not a decision taken lightly, and was enacted to reduce matchmaking times and reduce the potential of joining empty Operations servers.
In addition to this change, we pushed out a Live Service Update today that has now brought Operations to the Server Browser.
These efforts are community-focused to ensure Battlefield 1 players are able to quickly and successfully connect to Operations .
As with any change or update, we definitely want your feedback, so test out the changes and make sure to share your constructive feedback here on the Battlefield forums.