The behavior of the Type Into activity when executing the workflow is that the activity will remove a Single Line in Run mode and Multi Line in Debug mode. This is because the activity has the Empty field property set to NEmptyFieldMode.SingleLine, which means that the activity will delete the existing content in the field by sending Ctrl+A and Delete keystrokes before typing the text. However, the activity also has the Debug mode property set to NEmptyFieldMode.MultiLine, which means that the activity will delete the existing content in the field by sending Ctrl+A, Shift+Home, and Delete keystrokes before typing the text. The Debug mode property overrides the Empty field property when the workflow is executed in Debug mode. Therefore, the activity will use different keystrokes to empty the field depending on the mode of execution. References: [Type Into], [Empty Field], [Debug Mode]