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How to fix it
The defect number is BUG-000157748. This defect occurs after installation of the Portal for ArcGIS 10.9.1 Security 2023 Update 1 Patch. Currently, the status of the defect is "In Product Plan".
BUG-000157748: After installing the Portal for ArcGIS 10.9.1 Security 2023 Update 1 Patch, the Map Viewer's Styles pane fails to load, and other panes (Filter, Clustering) subsequently fail to load.
After installing the Portal for ArcGIS 10.9.1 Security 2023 Update 1 Patch, the Map Viewer's Styles pane fails to load, and other panes (Filter, Clustering) subsequently fail to load.
https://support.esri.com/en-us/bug/after-installing-the-portal-for-arcgis-1091-security-20-bug-000157748
People have same issue are talking about it
Map Viewer properties pane is blank (for Styles, Filter, Configure Pop-ups, Configure Fields, & Labels).
https://community.esri.com/t5/arcgis-enterprise-portal-questions/map-viewer-properties-pane-is-blank-for-styles/td-p/1281424
New Map Viewer -- 10.9.1 -- Styles Menu In-Op
https://community.esri.com/t5/arcgis-enterprise-portal-questions/new-map-viewer-10-9-1-styles-menu-in-op/td-p/1288823