In Kusto we have a desktop tool (http://aka.ms/ke) using Dev Express libraries where the IntelliSense does not pre-select any of the items, and any key that is not alphanumeric dismisses the IntelliSense without committing anything. We find this behavior much more intuitive and friendly for authoring Kusto queries.

Here is an example of the two behaviors:

In Kusto explorer, hitting enter or any other key will dismiss the intellisense:

While in Monaco hitting enter will commit the “and” requiring the user to either hit escape of delete the committed text:

Thanks Avner Aharoni