You can delete a style library if you don't need it anymore, and if it the styles, defined in ti, are not used by any element (text, master page, local text on page).
1.Run EdAdmin4, and then on the main screen, under Editorial Configuration, click Style Libraries.
2.In the list of style libraries, click the library you want to spike, and then on the Action menu, click Spike.
See also
Add, replace or remove style libraries
Note
The deleted style libraries may be undeleted, unless the system was purged. In that case, the deleted style libraries are lost.