At 10.7.1, I have a simple model that is supposed to add the final FGDB feature class to the ArcMap display:
I also have the correct Geoprocessing option set:
I run the tool in ArcMap by double-clicking it from its toolbox, not from within the editor window, as explained in this SE GIS post.
Sadly, the feature class is not added to the display. However, the model really does create the feature class, and I can manually add it to the display.
What am I missing?