1. Open the drawing toolbar and click the line button.
2. Drag the mouse to draw a straight line in the page and set the line thickness, color and style.
3. Select the line, "copy" it, and "paste" it three times to get the other three lines, and adjust their positions.
4. Select these four lines (Shift+ left button), and then right-click and select "Combination" in the menu to combine the four lines into a group (a whole), and the "four-line grid" is ready.
5. Then set the stacking order of this "four-line grid" to "Under Text".
6. Copy this "four-line grid" as needed to increase the number.
Tian Zige, make one with a border.