In my library, I use boxes to make series books easy to find. It's also a great space saver! These signs include cover images, title, and call number. See the editable version if you use a different call number format, need different series added, or would like to use these in a classroom setting where no call number is needed.
Digital paper credit to Erin Bradley Designs (https://www.etsy.com/shop/ErinBradleyDesigns)
Cover images used as part of fair use.