Add [wpgv_giftcard_modern] to a page. Customers walk through four steps: Select Template (filter by format and category), Setup your gift card (value, names, message, delivery date, own or gift), Payment and Overview. The templates shown are the Giftcard modern templates you designed in the template builder.
Which formats (landscape/portrait/both) are offered is set in General Settings → Select Template Mode; the number of templates per row in Templates Columns.