Hey, this is expected behavior. Composer 2 is a single model with a toggle called Fast. Fast is on by default, so it shows up in the model picker as Composer 2 Fast.
To switch to regular non-Fast Composer 2, open the model picker by clicking the model name or using Cmd+/, then toggle Fast using Edit.
More details in the Composer 2 announcement: Introducing Composer 2 Fast is the default option.