[System Representation] Product tree is very crammed and difficult to read

[LorenzoBichisao-ESA]

The system representation view is a nice addition allows the user to visualize the product tree and understand relationships between Element Definitions. At the moment though, the product tree in the view was given very little real estate and appears quite crammed. The majority of the view is taken by the parameters is the selected ED but the Parameter Editor view already does this.