John Gill Commentary Exodus 26:8

"The length of each curtain shall be thirty cubits, and the breadth of each curtain four cubits: the eleven curtains shall have one measure." — Exodus 26:8 (ASV)

The length of one curtain shall be thirty cubits, and the
breadth of one curtain four cubits
The breadth of them is the same as the linen curtains, but the length of them two cubits more; the reason was that they might hang down lower on either side, and the better to preserve them from any injury.

and the eleven curtains shall be all of one measure;
as to length and breadth.