Azure log analytics timechart with multiple dimensions

Following the https://docs.loganalytics.io/docs/Learn/Tutorials/Charts-and-diagrams#multiple-dimensions it says

Multiple expressions in the by clause creates multiple rows, one for each combination of values.

I want to query their sample database for networks bytes Send and Received per each computer. Starting with https://portal.loganalytics.io/demo?q=H4sIAAAAAAAAA1WOuwqDQBREe79iEAIKW2jAIoVpUqQLFpJ%2B1YkK7m64u%2BZFPj4PQsB6zjlMRTlFT1wHClGPhntaig7ssIXuXZJ3Kf7Azs02UA7aEGWJeIVKXEvvnXzl%2BIP62Rgt44PQlz75KUc9zUwVzpSWNowT%2FWJSKDKFTZECzR3NaJPFGYV8SN9t3gJth3oQ%2BsFNHUqss%2BgF6bL7icUAAAA%3D it should be something like

Perf | where TimeGenerated > ago(1d) | where (CounterName == "Bytes Received/sec" or CounterName == "Bytes Sent/sec") | summarize avg(CounterValue) by bin(TimeGenerated, 1h), Computer, CounterName | extend Threshold = 20 | render timechart

The problem is that Send and Received bytes gets grouped in the graph at computer level which doesn't make any sense.

How can multiple dimensions be represented as stated in the documentation so that I have Computer X Bytes Send and Computer X Bytes Received. As a note this was perfectly doable in the previous version.