This form is opened when you press the Composite button on the All Design Components context menu within the Layout Creator form and when you press Ok from the Layout Sheet Assistant from the Composite Layout Creator.
Add Design Components to Layout
Layout pattern
From the pulldown list choose the required Layout Pattern settings.
Design Components
Select the design component you wish to add to the layout. You can now either type a number to specify how many to add or use Ctrl-click & drag to quickly create a Number in X and Number in Y placement. Move the cursor in the x-axis direction to change the number of designs in X, and move the cursor in the y-axis direction to change the number of designs in Y.