Can I use native VSP Designer templates ('Web Mapping Application' items) and ArcGIS Pro layout templates ('Layout' items) at the same time for a VSW application?

While VSW 5.28 and higher supports both printing widget types in VertiGIS Studio Web applications, you can only use one type at a time in a particular VSW app.

Once the 'Printing Service Url' is specified in the 'Services' > 'Printing Service' section of your app the printing component will switch to searching for ArcGIS Pro PAGX layouts in your Portal, and execute prints using the VSP Engine Tools.