Problem Solved! All of the W3-CSS accordion examples show the < button > as the top part of the accordion and uses the w3-button class. The HTML < button > tag does not allow wrapping the display test. Period. The accordion does not have to use that HTML tag. I changed the < button > tag to a paragraph < p > tag, removed the w3-button class, kept the onclick code and other classes, and now I have a fully functional accordion where the top display text wraps appropriately, to include the text that displays below it when you click on it. All works in responsive mode as well. I did not use the bootstrap accordion as the posted advertisement above suggested! Bootstrap would NOT have worked either! It uses the < button > HTML tag as well which does not allow wrapping the upper display text.
(Newbie to this forum, but not to programming and web development)