Feature Request - switch between showing all colums and only PK columns

Currently, it is difficult to visualize databases with hundreds of tables and thousands of columns. For such large databases (and also for smaller ones) it would be a relief to be able to switch between displaying all columns and displaying only the PK columns. Maybe even a possibility to display without columns at all. So there should be a global switching possibility for the whole chart. And finally it would be helpful if you could expand and collapse a chart without columns or only with the PK individually.