A family of Microsoft word processing software products for creating web, email, and print documents.
Here is the whole page. That was dark mode, a Chrome add-on. I just cropped out the url.
I watched the video but nothing new. When you demonstrated opening the .dotm, Word correctly opens it as DocumentN.docx or .docm depending on the save as setting (as you demonstrated).
I fall off at the very first step. When I open the .dotm, it opens the actual template, with the full template name showing on the top bar. It's as if I right-clicked and selected "edit" in the context menu. There used to be two options, "open" and "edit." The former would give the behavior you demonstrated. The latter would open the template to allow editing. That is now the default and only option.