Why can not I connect to another xibo client installed in 2 nd pc

is the same version of the software xibo 1.8.3

You’re trying to connect to the CMS installed on another device with the localhost IP address, that will not work, if anything you might need to use your server PC IP, depending on how your server is configured.

You also have /web in the CMS address which implies incorrect environment configuration, please see - https://xibo.org.uk/manual/en/install_environment.html

so how i will configure my server to connect with another client in another pc
please give me more detail of that problem

how i will configure my server to connect with another client in another pc
please give me more detail of that problem