Delete all the existing custom widget(s) if no longer needed.
        Before you begin
You can delete only the widgets that are not associated with schedules or dashboards.
Steps
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                On the left pane, click the  icon. icon.The  Catalog page opens displaying the  Dashboards tab details. 
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                To view the widgets, click the Widget tab.
                
            
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                To expand the Global folder and view the sub-folders, click the expand  icon. icon.
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                Navigate to appropriate sub-folder by expanding the sub-folders.
            
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                Select the column header check box to select all reports or select specific reports.
            
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                Click the Delete Catalogs
                     icon. icon.A message appears asking for your confirmation to delete the selected catalogs. 
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                Click Yes.
                The catalog widgets are removed from the folder.