Click the + button at the bottom left to add an Expression :
Click the trash icon button at the bottom left to remove the selected Expression :
Click on the eye icon next to an Expression name to hide it :
This can be useful for example when you create an intermediate Expression that will be re-used in other Expressions but not displayed to the end user.
Expressions can be used in any other place where a data field can be found :
- Widget data binding
- Filter configuration
In the Data Preview of the Data Source, you can also view a preview of the Expression as if it were another field in the data.