You’re saying want the P1, P2, P3 and P4 to read left to right, do you mean you want them to be their own row rather than a column, basically as headers? Right now your data is presenting the data per each panel from left to right, so i’m assuming you mean you want the panels as headers.
If I’m understanding correctly, then I would remove the first List.Create node and feed the list you were putting in for item 1 into the first List.Transpose. Then add this line of code into a code block and feed it into your “List.AddItemsToFront” node and see if this gives you the results you’re looking for:
DSCore.List.Transpose({{"Level"},{"P1"},{" "},{"P2"},{" "},{"P3"},{" "},{"P4"},{" "}});