Since 6.0, a lot of bloat and whitespace has been added to the VFX graph blackboard, making it more cumbersome to use than the previous version. The extra space in the title area and the large gaps between properties are particularly frustrating because having less properties on screen means more scrolling and reduced efficiency.
The blackboard has been re-worked so that it can now also handle attributes and not just properties.
This allows you to do contextual drag and drop action to either get or set a Built-in and/or custom attributes.
Meanwhile, we worked with the design team to find a balance between readability, usability and also consistency across the Graph tool and editor.
I am not sure if you saw this, but they are Tabs, that allow you to display either All (Properties + Attributes), only attributes or Properties. This can help allow you to get more Properties without the need of scrolling, but I guess it depends on the number of properties 
In any case, I’ll transmit your feedback to the design team. Thanks for letting us know