1) Click "Fence Template" , expand the template and select a suitable fence. Commonly used fences can also be selected through the common toolbar;

2) Determine the size of the matrix to be entered (rows and columns), move the cursor into the fence, click "Matrix Template" , expand the template and select a matrix of the appropriate size.

Note : Click the bottom row of "Matrix Template" and a window will pop up

In this window, you can input a matrix of any size. You can also click on the common toolbar to input a matrix of any size.