PROBLEM
In ArcGIS Web AppBuilder, when attempting to delete a feature from a web map using the Smart Editor widget, the Delete option is unavailable, as shown in the image below.
The Allow Delete option is not enabled in the Smart Editor widget configuration.
In ArcGIS Web AppBuilder, check the Allow Delete check box in the Smart Editor widget configuration to enable the Delete option.
Note: Ensure the layers are editable in the web map. Refer to ArcGIS Online: Manage editor settings for more information.
The image below shows the Delete option available in the Smart Editor widget in ArcGIS Web AppBuilder.
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