Hi Guillaume
a very good suggestion, should definitely be considered in the future updates.
The matrix in Prolaborate currently lets users fine tune and view relationships and its details with a number of filtering options and settings. The initial focus was to make an architectural view simple and focussed.
For example the option to hide empty rows, or empty columns is a significant value add when you have a whole raft of items in a package that are yet to be connected.
You can also have multiple connector types, multiple stereotypes etc, so that you can anlayze model in multiple dimensions.
However, we will include your suggestion for a future improvement.
Best Regards
Nizam Mohamed