Re: Sims 4 - build mode blue, not showing design
@krsukkau Have you added windows yet? The lighting inside fully enclosed rooms can be almost nonexistent. As an experiment, try building a single room with a couple of windows on each side, while Build/Buy is set to afternoon lighting. The button to switch the time of day, at least as far as what you see in BB, is with the other controls at the top middle of the screen.
If you see the same effect, please post a couple of screenshots, and let me know whether your computer runs Windows or macOS. It would also help to know the graphics settings you're using; you can put the game in windowed mode and take a screenshot of that as well. Images can be embedded within the text of a post, which is especially helpful if you want to attach more than three to a single post.