Hi!
When editing an ArchiMate diagram, all the elements in the Toolbox use the Rectangle Notation.
This makes the icons very small and not so convenient to distinguish.

There are few exceptions: for example, in "Archimate 3.1 / Application / Active Structure Concepts" the Application Component is represented as an icon rather than using the Rectangle Notation.
I think that

editing would be a bit more convenient if elements would be represented with Icons, instead of with Rectangle Notations