When creating longer notifications that require scrolling, it may be useful to split the editor pane so that multiple sections of the notification can be viewed at the same time.
To use the splitter, with a notification open in the editor, click and drag the splitter button in the top right corner of the editor pane.
As you drag the button down, it will become a bar that splits the editor pane into two mirror images.
Any content in the notification will be mirrored between the two panes, and any changes made in one pane will be made in the other.