John 19:40 (KJV)
Then took they the body of Jesus, and wound it in linen clothes with the spices, as the manner of the Jews is to bury.
https://simple.uniquebibleapp.com/bible … /19#v19_40
Yes, the shroud was folded in half and covered the entire back and front of the body. But, the shroud cloth was originally two pieces, not one. This is evidenced from another weave that sewed the main cloth and the side strip together.
The side strip on the Shroud of Turin, the apparent seam separating it from the rest of the cloth, and the two missing panels of cloth at the top and bottom of this strip that reveal the underlying backing cloth have long been a subject of interest and speculation to sindonologists.Figure 1 (below) shows a portion of the x-radiograph of the section of the Shroud’s frontal image displaying the end edge of the side strip, the missing panel with the exposed backing cloth, and the seam between the strip and the rest of the Shroud.
https://www.shroud.com/adler2.htm
It is most likely this side strip was wrapped around the body with the shroud to hold it all together.
Dr. John Jackson explains his theory in this BBC documentary:
https://debatingchristianity.com/forum/viewtopic.php?p=1105582#p1105582