Why not?

It works for me.

If you fill in left it opens the menu of the hamburgermenu (the dropdown behind the button) on the left, else on the right.

And also the the lettertype is seen in this way.

Look close at the picture in x5 and see what you change also change in the picture.

And it should also be seen on the review and website offcource.

So it's about the menu that comes out if you press the hemburgermenu.