1. After opening the Word document, click the Insert option in the toolbar above, and then select the picture;
2. Click on the picture and the picture toolbar will appear. Click on the location option, and select the middle center option in the text wrapping, or you can wrap the text in any form except embedding in the picture toolbox.
3. Finally, in the Format Picture dialog box, under the Size tab, uncheck the box in front of Lock Aspect Ratio, and then click OK. When selected, the picture will be automatically centered. Then, we can resize the picture to cover the whole word interface.