I am looking to resize view.popup dynamically in ArcGIS Javascript API 4.x as was able to do in ArcGIS Javascript API 3.x using the map.infoWindow.resize(330,300);. I have only found .esri-popup__main-container.esri-widget in 4.x which can only be set once.
One option might be to use the Feature widget to display the popup template content in a resizable container.
Thanks, I will try.