These toolbars are visible by default when you open the Dope Sheet. For the most part, they contain controls that are active only in the Dope Sheet.
The Display toolbar contains controls for managing key selection and editing, including how to edit tracks in a hierarchy.
Provides extra tools for use in Dope Sheet mode.
The Keys toolbar for the Dope Sheet contains the Filter button and other display controls, as well as buttons for transforming keys and editing them in other ways.
This toolbar, hidden by default, provides tools you use when working with ranges.
Controls on the Time toolbar let you select time ranges, remove time, scale it, insert it, or reverse its flow.
