Turning off the expanded Description field in transaction windows
To deactivate expandable Description fields in all windows where they are available, display the Windows tab in the Preferences window. Then unmark the Use Expandable Data Entry Fields in Windows option.
When this feature is turned off, you'll be able to see only the first 30 to 60 characters of your entries in the Description field. You can use your keyboard arrow keys to scroll through the field if you want to see more of the text, however.