Templates fix the zones; you fill the fields
A carrier-style template divides the canvas into fixed regions: return address in the top-left, recipient address in the center block, and a bottom strip for weight, date, and barcode. You enter the text and the tool composes it into the template at the size you pick. Text that outgrows its zone wraps or needs shortening - an overflowing address block is a common cause of labels the carrier's sorters misread.