In ArcGIS Experience Builder, the Print widget does not print all of the labels of a feature layer if the Print widget is made inside a Widget Controller widget.
This issue is not reproducible in ArcGIS Experience Builder. If the issue occurs, contact Esri Support Services as additional information is required for further investigation.
解决办法
Create the Print widget outside of the Widget Controller widget.
Add the already made Print widget into the Widget Controller widget.
Deploy the application, and the Print widget should print labels.