Custom Script functionality will disable some functionality in SharePoint
If Custom Script is Off then you will lose some features which you use generally in SharePoint i.e. : Save Site as Template will be disabled. Option to create Template from a site will be invisible from Site Setting. SharePoint Designer Pages that are not HTML can no longer be updated. Handling List: Create Form and Custom Action will no longer work. Subsites: New Subsite and Delete Site redirect to the Site Settings page in the browser. Data Sources: Properties button is no longer available. Save document library as template will be disabled & you won’t find option to save document library as template in Document Library Settings. Solution Gallery will be invisible from Site Settings. Theme Gallery will be disappear from Site Settings. Help Settings will be invisible from Site Settings. HTML Field Security No longer available in Library Settings. Solutions Gallery is no longer available in Site Settings. Uploading files that potentially include ...