For a better overview, you can hide connections.
Procedure
Open a matrix model.
If required, click Contents.
Activate the Connection types tab in the Contents bar.
In the Display column, disable the corresponding check boxes for the relevant symbol type pairs. The Contents bar on the Connection types tab shows symbol type pairs visually separated from one another by a line.
If you clear the check box in the row that defines the default connection, this check box is also disabled.
To hide all connections at the same time, right-click any check box, and click Deselect all.
The connections are no longer displayed in the matrix model. These settings are saved when you close the matrix model. When it is opened again, these settings are active.