In case you are developing some MQTT solution, doing testing, etc, and during that operation you create several hundred of connections, you can use the following feature to close connections grouped by domain, clientId or all connections (in all cases, except panel admin connection).
To do it, click on showing all connect devices:
Now click on closing connections button:
Now select selection pattern and follow process:
Remember you can always close a single connection clicking on button associated at each row: