New Network Notification

I have received a “New Private Network Detected” notice. I don’t have the option to NOT join. What can I do to make sure I don’t give anyone access to my computer? The IP of the new private network is

Thank you.

No worry. Your PC was simply temporarily unable to renew an ip public address with the DHCP server and the Windows feature of automatic private IP addressing (APIPA) assigned itself temporarily an address in the range 169.254... As soon as the DHCP server will be reachable, you’ll get a public IP address as usual.