It should be possible to access all the alternatives in Branching Question
This issue happens when the content starts with the Branching Question that contains lots of alternatives. In this case - the question won't resize the container.
Can be seen here > https://h5p.org/node/553310. If, however, we add a content node before the question - the container will resize properly > https://h5p.org/node/553320
Looks splendid !