Here is a tutorial that shows how to turn a separating zipper into a closed end zipper.
How to Sew a Recessed Zipper (Open End Method) - Bethany Lynne Makes
Turn a separating zipper into a closed end zipper tutorial
How To Sew A Separating Zipper: Top-Stitching And Faced Method
Closed-End Zippers
How to Sew Zippers (Separating and Closed End)
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Turn a separating zipper into a closed end zipper tutorial
Making a Zipper – Grainline Studio
Zip Tips: How to shorten and install a separating zipper - Hey
Turn a separating zipper into a closed end zipper tutorial