Hi,
If mouse hovering colors above a reference plane or a shape handler are different, it can increase work efficiency.
Now, the color is "Blue" only. But, for example, if the mouse hovering color is blue above a reference place when a user tries to select a reference plane and, if the mouse hovering color is "Magenta" above a shape handler when a user's mouse cursor is going to select a shape handler, the user can recognize which type of instance the user is going to select.
So, it can increase work efficiency.
Thank you.