When you select a grid pattern, the selected number of grids displays in the viewer. To resize a grid, follow these steps:
Place the mouse cursor over the border line (the cursor icon changes to a two-directional arrow or a four-directional arrow). This indicates the direction(s) you can move the border.
While holding down the mouse button, drag the mouse to change the grid size. If images are displayed in the grid, the image size changes with the grid size.