The WebOffice installation package includes a variety of predefined layouts in all standard paper sizes (A4, A3, A3, A1, A0), both horizontal and vertical.
If you want to create a new layout, it is recommended to copy an existing layout file (.pagx) and adapt it according to your requirements. The advantage here is that the alignment of the data frames, logo fields and function fields are already appropriately set for the layout size.
To edit a layout template, proceed as follows:
1.Start ArcGIS Pro and change to the layout view (e.g. via Insert Tab - New Layout)
2.In the Insert tab in ArcGIS Pro the authoring tools of VertiGIS Printing Layout Designer should be available

VertiGIS Printing Layout Designer - Toolbar in ArcGIS Pro
3.Open an existing .pagx file.

Import layout
4.Adjust the layout according to you requirements. Insert and place the elements as you wish and adjust e.g. textsize, color or type

Adjust layout elements
5.Save the Layoutfile (.pagx file)

Save layout