There isn't a way to make the lesson content go full screen unless it's a video, because of the top and bottom bars. As a result, there's a lot of scrolling involved because part of the content is always below the fold, even on a 15" screen. This happens even when I make Chrome go into full-screen mode and the only way to have all of the content available without scrolling is the zoom out to 75%. That's not great for my child's eyes and scrolling is frustrating, especially when there are game-like online tasks. Scrolling also results in accidental clicks, which in turn result in accidental wrong answers.
Could you please consider making it possible to expand the main lesson content to full screen and hide the top and bottom bars? That would be a significant improvement, in my opinion.