why i cant bent my plane? I want to bend my plane in y-axis but it's not happening. I have been facing this problem from many days
Simple deform modifier is sometimes... not very intuitive.


You need to rotate the origin point by 90 degrees, so that all axis work 
Check Tool > Transform > Origins and use the Rotate tool. Then uncheck.
When using an Empty as origin, the same rule applies.


I'm not sure why it works like this :).