In general design, the width of the door opening is 900mm. If the door frame is removed, the door leaf will be almost 860mm. If it is 730, it means your door frame is too big. The door opening is left 900mm so that large furniture such as beds and sofas can enter. The size for a single person to pass through is 500mm, and 730mm can ensure that two people can pass sideways in both directions. As long as it doesn't affect the entry and exit of the furniture, it won't affect the overall beauty and it's fine. If you really have obsessive-compulsive disorder, you can only redo it.