If the database has got a relatively small number of tables, there is no problem with arranging tables. But once you create a relatively big database arranging it manually becomes painful. It would be really cool if the auto arrangement would group tables based on whether they are related or not. In this case, it would product a visualization of a graph consisting of a set small islands of strongly related tables.
Thank you for your feedback. We really appreciate it.
The improvement to the auto-arrange feature is already in our backlog. We will let you know if we have any updates on this feature.