Better UI to visualize main line and products on it

After years of support, I get reports from a lot new integrators in KNX that it is difficult to see and understand how the main line shows in ETS. The fact that the main line is not an actual line and the products in the main line appears after the lines, are confusing.

There should be a better way to show the main line, maybe as a dotted line or another color and I think it should be first/at the top instead of only products shown in the bottom of the area in the topology window.

- Rune