If you want to remove (delete) a mixture (rather than just hiding it), you need to choose whether you also want the mixture's components to be deleted.
Follow these steps:
Locate the mixture in the Patterns List.
Right-click on the mixture and choose: Delete from the contextual menu.
Follow these steps:
In the Patterns List, ensure that the relevant mixture group is open (click its disclosure triangle to reveal the mixture components).
Drag all of the components outside the Mixture group. This is best accomplished by selected all components, and then dragging the group outside the Mixture.
Select the (now empty) mixture pattern, and choose Delete from the Patterns List contextual menu.
See Also