Use the same viewpoint when comparing the product and your room.
Msofas describes left and right while standing in front of the sofa and looking at it.
A practical way to check
Draw the room from above, including doors, windows and the intended sofa position. Mark the longer corner section and compare it with the selected product image and description. Do not rely on how the layout looks when you are sitting down. If the diagram and option name seem inconsistent, ask the team to confirm before ordering.