As mentioned upthread, for reasons I don’t yet know it won’t maximize if, and only if, the course is AICC and launched from an LMS. Clicking the maximize button has no effect. (On Firefox I can right-click and go full-screen, but Chrome/Chromium does not allow this.) If I publish as HTML maximization works fine. No clue what’s up with that. I haven’t tested anything but AICC and HTML (no SCORM, no xAPI, etc.). I can’t test maximizing because … I can’t maximize.