Try jupyter notebook --ip <your_LAN_ip> --port 8888
Then visit http://your_LAN_ip:8888 from another computer.
It’s recommended that you use a password when accessing your notebook server. To set up a password, just run jupyter notebook password. To make it even more secure, you can use SSL for your server by passing the arguments --certfile and --keyfile to jupyter notebook. You can read more about setting that up here.