Some players have reported that lobbies are sometimes bugged out with the Find Match feature. This isn't an issue that you will bump into often, but the team is still investigating it. As you might expect, our internal testing didn't uncover this issue, but a rather large flow of players quickly did.
That being said, there's no worries!
In the event that a lobby gets full but never resolves to character select (please note that lobbies should never take more than 2 minutes to resolve), there's the probability that you might enter this screen upon cancelling the queue:
To get out of this state, you can use the squad leave button, located at the bottom right of the screen:
This will reset your game to a fresh state, and you'll be able to launch another queue without issue.
Rest assured this will be a priority for the team to fix,
RageCure Dave