Combination 3-needle bind off. Knit and Purl.
Well-known 3-needle knit bind-off is great for knit side of Stockinette. If you apply it to reverse Stockinette or Garter stitch, you will see that purl stitches separate and knit “road” will go through your fabric.
Watch the video for 3 ways to work three-needle bind-off.