New objects are always inserted in the selected row or column in the matrix model. You can change the arrangement of objects in the matrix model subsequently.
Procedure
Open a matrix model.
Select the objects you want to sort.
To sort all objects, right click the row or column header.
Click Sort ascending (A-Z),
Sort descending (Z-A), or
Sort by type.
The matrix model is sorted based on your settings.
Tip
Select adjacent objects by holding down the Shift key and clicking the first and last object. You can select objects that are not adjacent by holding down the Ctrl key and clicking the relevant objects. You can extend or reduce your selection using the arrow keys.