Hi,
Looks like it is not possible to enable it from console in Dialogflow CX.
In Dialogflow ES it is possible by going to Settings > Advanced and then clicking on "Enable Sentiment Analysis", whereas in Dialogflow CX if you go to the same section you just find a link to Sentiment Analysis API documentation.
Therefore, as the documentation you liked suggests, the only option in CX is to enable the Sentiment Analysis for each
detectIntent or
streamingDetectIntent call by setting the
analyzeQueryTextSentiment field to
true.
Remember that, if it is more convenient for you, it is also possible to use the API through the client libraries.