Thank you. Do you mean Map Size 3 on the meta tree, the one shown in the screenshot?
If so, it is available in the demo. However, we currently have a bug that prevents interaction with anything below the SET SAIL button, the one NicholasJDi mentioned in his comment.
We will hotfix this soon. In the meantime, you can move the entire skill tree to the left by holding the right mouse button and dragging it to interact with those perks.