The Castalia sidebar is a narrow gutter that appears to the right of the Delphi editor. It provides an overview of the file currently being edited, showing the location of things like bookmarks, syntax errors, search results, etc...
Clicking on the sidebar will take you to the line of code indicated by the sidebar graphic.
The sidebar is an excellent aide in code navigation. By showing you where all of your bookmarks and other important lines are all in one glance, Castalia's sidebar helps you to quickly find where you want to be and work through your code.
Castalia's sidebar also aids in code comprehension. By showing you where refactorings are being applied, or where you may have syntax errors in your code, the sidebar helps you to fully understand how your code is structured and how it will behave.
Code Analysis