Hello, I’m a beginner in Unreal Engine. In my project I need that when a player presses a button he blocks the button for other players, but at the moment each one is blocking his own.

Hi, keep in mind that widgets don’t replicate, they only exist locally so you will need to replicate this in some actor that does replicate and exist on all clients.

To learn more about replication you can download the content examples project and look through the replication examples, doc here Networking Content Examples | Unreal Engine Documentation

This might be too far for beginning, but will be useful to look up things