The expert here is Illustrator, the drawing program.
Creating a Seamless Diagonal Pattern in Illustrator Seamless means the pattern is continuous without any break or obstacle (also called a
repeating pattern or tileable pattern). Many beginners struggle to
create seamless diagonal or other such patterns that cannot be created
manually. But once you know how to do it, this approach can be very
useful in your design or illustration work
aka diagonal line pattern
How To: Create a Seamless Diagonal Line Pattern in Illustrator
March 17, 2023
You basically have to go and use the program to change the pattern or rotate it to get the pattern in the direction you want. Diagonal left or diagonal right.
Oracle also use the term left and right:
Section - 2 : Diagonal Left and Diagonal Right Shading patterns
One text says: The 12.6.0 output reversed that, so that the diagonal left [line] pattern was printed as diagonal right.
This was an Oracle fix for the diagonal left and right came out correctly.