Bruce and Jim, thank you for your help. I now understand better what is going on.
First, Jim, I did heed the recommendation you made in your video and in the “Matrix Header and Horizontal Scrolling” help page, that the Row Height should be set to 0 points. However, I did not change the Row Height by typing a zero into the space with the height number, but by clicking on the “less” button next to that space. Using that method, the smallest that number can be reduced to is 1 px, and in doing so the row height is squashed down until all of the rows disappear into a blank matrix object. I even had a go at setting the Row Height in the Blueprint of that object, but it did not like the zero that I typed in and reset the Row Height to 13 px.
I did not think to move the Matrix Frame Header to sit on top of the Matrix, mainly because I was under the impression that the actual position of a named Report Tile, such as when it is used in setting up a report to be printed, had no effect on the final appearance of the report. But I tried that after reading your comments, Bruce and Jim. Again, unless I did not do it correctly, I am not a fan of dragging the Matrix Frame Header to the top of the Matrix. It just looks out of place with the lower border of the Report Tile being in view.
After typing zero into the Row Height space, or making that space empty, the two sides of the Header appeared immediately, and 0 px. was displayed in that space. So the only question I have about this now is why is the top border of the Header missing?
Jim, the PDFs I was referring to are collections of the slides that you presented in your training videos. A year or so ago I downloaded these files (sixteen of them) from one of the pages on your Web site. I have gone through most of these files several times since then, and they have been very helpful. At that time, I also downloaded PDF files of six of the Panorama 6 books that you made, and I use them for reference as well.