Explanation
Custom gantt filters are filters that allow dispatchers to view service appointments based on specific criteria such as status, priority, or custom fields[67]. Creating a custom gantt filter would allow providing a view of emergency work that is only visible to dispatchers by setting up criteria such as status equals emergency and sharing the filter with dispatchers only[68]. Custom lightning component is a component that allows developers to create custom user interfaces using Lightning Web Components or Aura Components[69].
Creating a custom lightning component would require coding and would not leverage the existing gantt chart functionality. Custom report in a private report folder is a report that allows users to view data based on specific criteria such as objects, fields, filters, or charts[70]. Creating a custom report in a private report folder would not provide a view of emergency work on the gantt chart and would not allow dispatchers to schedule or reschedule service appointments. Custom list view is a list view that allows users to view records based on specific criteria such as filters, fields, or sorting[71]. Creating a custom list view would not provide a view of emergency work on the gantt chart and would not allow dispatchers to schedule or reschedule service appointments. References: https://help.salesforce.com/s/articleView?id=sf.fs_gantt_filters.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.fs_gantt_filters_create.htm&type=5
https://developer.salesforce.com/docs/component-library/documentation/en/lwc
https://help.salesforce.com/s/articleView?id=sf.reports_builder_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.customize_listviews.htm&type=5