In ArcGIS Experience Builder, the 'Show pop-up upon feature selection' option returns a blank pop-up if the feature service used to configure the Search, List, or Table widget was published from ArcGIS Pro.

Workaround

Export the feature service as feature geodatabase and publish it directly from ArcGIS Online. The republished feature service will show the pop-up correctly in ArcGIS Experience Builder.

Steps to Reproduce