1. Now you need to draw a square on the document. We click the rectangle tool in the document drawing toolbar.

2. After clicking the rectangle tool, hold down the SHIFT key of the keyboard and draw in the blank position of the document. Draw a square.

3. Now, we need to customize the size of this square. For example, a custom square is 5cm wide and 5cm high. At this point, the square remains selected, and the cursor double-clicks the square;

4. Pop up the operation box; At the top of the box, click the Size tab.

5. Click "Size" to enter the page; Here, we see "height" and "width";

6. Delete the original data in the input box on the right, re-enter "5" and click OK.