You can edit directly in the Properties Pane window using the Edit icon. The image below shows the different property values that appear in the definition. Each category coincides with the Chapters/Tabs that appear in the definition dialog. The definition that you edit is locked, just as it is when you open the definition dialog.
When you click the Edit icon, another set of icons appears. The Save icon saves and applies all changes that you make to the definition.
When you save or cancel the definition it becomes unlocked.
When editing in the Properties pane, there is no spellcheck feature.
Advanced Edit
Click the Advanced Edit icon to open the definition dialog. The definition is locked until you save or cancel any changes. The Advanced Edit has access to more property values, and you can use the spellcheck feature.