I'm trying to print field, but only the first line in each container prints.
Is this a field of type Container? Or are you trying to describe something else here? Container fields generally hold entire files such as a graphic image or a PDF file.
If this is a text field and only the first line of the text field is printing, that suggests that you need to resize the field to be tall enough to display the entire contents of the field on your layout. You can use Sliding to "shrink" the space needed for those records that don't need such a large text field for printing.