When the pop-up contents is set to 'A custom attribute display' or 'A description from one field' and only a few fields are selected to appear when configuring a pop-up in an ArcGIS Online web map, all fields are automatically displayed in the attribute table in the associated web application.
Duplicate of BUG-000106866: Identical bug was incorrectly logged twice. Closing this bug.
対処法
1. Edit the web application.2. Edit the Attribute Table widget.3. Under Configure layer fields, click Edit. 4. Select a few layers to be visible. 5. Save and launch the web application. 6. Click at any point on the map. When the popup appears, click the ellipses > View in Attribute Table.7. Note that the attribute table now only displays desired fields.