ArcGis Pro 3.1.4.
I'm sure there's a functional limit to the number of layouts in an *.aprx but the standard messaging is unlimited number of layouts.
There is no specified limit. For more information on Layouts, you can explore the help topics beginning here...
Layouts in ArcGIS Pro—ArcGIS Pro | Documentation
Les membres connectés peuvent publier, suivre les mises à jour, et plus encore. Nouveau ici ? Inscrivez-vous gratuitement.
Find useful guides, FAQs, and documents to help you navigate and make the most of Esri Community.