As told by Manx in the pixeltail discord, there aren’t any “Reversed” versions of certain items like this one in the screenshot, i don’t know how many items are like this but it would be a really good idea to have left and right versions of these kinds of furniture.
EDIT : the one on the pic is done by using the Gizmo and set the x value to -1.0, it works but there were some bugs with this process and the color of the “Reversed” desk using the process had to be reset.