How can I automatically maximize all inserted artifacts when opening a business requirement document?

There are several ways to "import" a Word document into RDNG and they of course produce different results and you may want to try them all and see which one works best for you.
1. Import requirements from within a text document - you have the option of creating a module, and the requirements will be "extracted" from the text document.
2. Import a text document and convert to a rich text artifact - this produces a single requirement artifact and it no longer has any links to the original Word document. The keyword here is "convert" - think of you convert a Word document to an HTML file using Word itself.
3. Upload artifact - this creates a wrapper artifact containing the original Word document. You can then take either of the above options to "extract" or "convert" the document.

The below link shows the first two options. Note that the video is recorded with an older version and the interface looks slightly different from the current version.
https://jazz.net/help-dev/clm/topic/com.ibm.rational.rrm.tutorial.doc/topics/lesson4_rrm.html

I guess you have used either the 2nd or the 3rd option, but then there should be no "artifact ID" generated within the artifact. There should be only one ID which is associated with the single artifact that you have imported. I guess the numbers that you try to see are those associated with ReqPro in the original Word document?

This forum does not support private message (as far as I know), and it is not a good idea to share email addresses on a public forum, as you will get spams very soon. Maybe you can post the image on other sites and link back here if you want to show a screenshot?