IntelliSense is a general term for various code editing features, including code completion, parameter info, quick info, and member lists. IntelliSense features are sometimes called by other names such as "code completion", "content assist", and "code hinting."
We are adding the similar IntelliSense experience that you experience today in Visual Studio tools to make Azure Data Factory/ Synapse pipeline developers more productive while writing complex expressions in their data pipelines!
IntelliSense in the Expression Builder can help reduce manual errors and simplify using parameters, activity outputs, validations, quick info on functions, member lists, etc.
We will be improving this experience further and are interested in your feedback.
Please do send us your feedback and suggestion through the ADF UI.