What should I do if I want to change the layout after whole-house customization is done?

Don't rush. How the layout can be changed depends on the extent. If it's only the internal shelves or the door panel direction, adjustments are usually fairly flexible; but if it involves cabinet body positions or plumbing and electrical points, the space must first be re-measured to confirm the condition of the walls and kickboard. During measuring, we first check flatness and internal/external corners, then decide the closing method, and re-measure after the plumbing and electrical positioning is completed. So if you want to make changes, say so as early as possible, don't wait until production has started. The processing cycle is generally 15–45 days; the earlier you communicate, the easier it is.