Main toolbar > Curve Editor (Open) > Select a deletable track in the Controller Window. > Right-click the toolbar > Show Toolbars
> Controllers: Track View > Delete Controller.
Main toolbar > Open Track View > Select a deletable track in the Track View Hierarchy. > Right-click on a blank area of the
Track View toolbars and choose Show Toolbars > Controllers toolbar > Delete Controller.
Some node subcontrollers can be deleted. Visibility tracks, Image Motion Blur Multiplier, Object Motion Blur, and On/Off are examples of controllers that can be deleted. Most controllers, however, are not deletable.
You can also delete a Visibility track by using Tracks > Visibility Tracks > Remove.