A family of Microsoft word processing software products for creating web, email, and print documents.
Hello Herman,
Unlike lines and shapes, the option to set a default picture line width is not available in Word. However, what you can do instead is to duplicate (copy and paste) an image that already has a line width of 1pt, right-click on the duplicated image, click on Change Picture, then select the image that you want to use. For suggestions and feedback about Word, you may post it on Word UserVoice.
Let us know if you require further assistance.