You can apply a color background to entire rows or columns.
Procedure
Open a matrix model.
Click in a row or column header.
Select multiple rows or columns by holding down the Shift key and clicking the first and last row or column. You can select rows or columns that are not adjacent by holding down the Ctrl key.
Click Properties. The Properties dialog opens.
Object appearance is selected on the Selection tab.
Left click in the color field. The Choose color dialog opens.
Specify the relevant settings and click OK.
A color background is applied to the row or column containing objects. Only those cells in which connections are not allowed have no color background.