The Designer provides a Messages panel which you can
show or hide. This panel is dockable in any position within the main
panel or can be a separate window.
The Messages panel displays a list of messages, see the
following figure.
You can filter the list according to the severity level
as shown. By default, only messages of level Severe and above are
shown.
The messages help you to debug your style rules.
If you expand a message, you can see the details of the
style rule and styling property value that caused the error. You can
double-click the style rule listed below the message to highlight:
The rule in the Style rules hierarchy
The affected nodes in the Diagram (if
any)
The property setting in the Styling
Customizer (if the cause was a property setting)