See Further into the Future on the Gantt
Where: This change applies to Lightning Experience and Salesforce Classic in Enterprise, Performance, Unlimited, and Developer editions with the Field Service Lightning managed package installed.
Who: Users need the Longterm View custom permission to see the Long-Term option in the Gantt resolution menu. This view replaces the 5-week Multiday view, which had fewer customization options. No permission is needed to highlight weekends or see the 2 Weeks view.
Why: The long-term view gives you greater control over which appointments appear.
You can now choose Long-Term or 2 Weeks in the Gantt resolution menu (1). Customize your long-term view from the Hours tab in the Gantt filter (2).
Highlight weekends in orange (3) regardless of the view by selecting Highlight weekends on the Hours tab. Make sure that Show weekends is also selected.