With the Printing Designer, you can create and edit print layouts and layout packages, available in both SaaS and on-premises deployments.
A layout package is a collection of ArcGIS Pro layouts stored as a single portal item. VertiGIS Studio products can reference these packages to produce advanced print outputs.
You can also create layouts using VertiGIS Studio Desktop Printing. Your choice depends on your licensing and the complexity of your layout requirements.
See also: Convert Legacy Print Templates