I have the following code:

WAITFOR(
    RECEIVE TOP (100)                   
        message_type_name,
        CAST(message_body AS XML),                  
        conversation_handle
    FROM MyDemoQueue
    INTO @ReceiveTable
), TIMEOUT 10000;

But I only get one entry even though there are 10 in the queue. I saw a lot of posts about this and i know that this is related to conversation groups and i should put the messages into one conversation group.
Service Broker only receiving one message at a time

All messages that are returned by a RECEIVE statement belong the same conversation group

But I can’t find any code examples on how exactly I should implement this. Only theory. I can’t even find it in the official documentation. Should this be on the sender’s or the reciever’s side? If anyone has ever done this before, please share code examples.