Agenda view is only visible in month view. Please make it available with every view, or even include it in the left sidebar as requested in https://outlook.uservoice.com/forums/919084-windows-10-calendar-preview/suggestions/39553060-more-content-in-the-sidebar
Tony Beretini commented
Yeah agenda view should be visible in all calendar view options. It would make sense to allow users to enable it regardless which view you are in. I would also like to see an option in agenda view to hide or show empty time slots on my calendar.