X button
Lawson forms have an X button in the top right corner to the forms. When you click this button, you are closing the form and all related sub-forms.
For example, you opened a sub-form from within a form. When you are finished working with the sub-form, it might seem natural to you to click the X button to close the sub-form and return to the main form. When you click the X button in this case, you will end your session with the form as a whole; the sub-form and main form will both be closed. To return to a main form from a sub-form, use the form's Back button.