The Expression Decoder can be used to understand and investigate long or complex expressions.
When viewing the Expressions page, click the "Eye" icon on any expression to open the expression in the Expression Decoder. The "Eye" will appear when the mouse pointer is placed in the expression cell. For longer expressions, you may also click the "...more" link.
The Expression Decode panel is divided into a upper section that displays a colorized version of the expression text, and a lower section that navigates the expression in a tree view. Clicking an element in either section will highlight the element in both sections.