Logic Pro X Delete staff styles
You can delete staff styles in the Staff Style window in both Single view and List view. In List view you can select and delete several staff styles simultaneously.
Delete the current staff style in Single view
Choose New > Delete Style.
Delete multiple staff styles in List view
Shift-click the staff styles you want to remove, then choose Edit > Delete (or press the Delete key).
Tip: In List view, you can use the Edit > Select Unused command, to select all staff styles that are currently not assigned to any regions or track instruments in the project.