as far as I know, PHP my admin have setting user can remote access or not.
you have to search this file and do some modification
If you install php xampp on port 80, in example, you can access phpmyadmin on port 80 from another computer using ip or computer name and port.
in example :
or in example your ip is 18.104.22.168
so, your phpMyAdmin should :
At your xampp there is setting are server can use remotely or not something like this
You should search this file: