Can web app be shared from ArcGIS Enterprise portal or ArcGIS Online without sharing the web map?

No, a web app cannot be shared independently without sharing the source web map it is created from, as it relies on the data and configurations of the source. Sometimes, sharing a web app without sharing the web map is preferable to avoid unnecessary changes to the source map. As a workaround, create a view layer as the source layer to restrict editing capabilities or adjust visibility while maintaining the functionality of the web app. Refer to the following documentations for more information:

• ArcGIS Online: Create hosted feature layer views
• ArcGIS Enterprise on Windows and Linux: Create hosted feature layer views

Another option is to configure the hosted feature layer’s edit settings to limit editing on the layer. Refer to the following documentations for more information:

• ArcGIS Online: Manage hosted feature layer editing
• ArcGIS Enterprise on Windows and Linux: Manage hosted feature layer editing