I am using Vuforia 4.2.3 and unity 5.1 . I am using "Screen space - Camera " type of canvas and assigned the camera from ARCamera to the canvas. 

I have also used Canvas Scaler with reference Resolution 600x800. 

Now I am facing a major problem regarding the canvas. On various devices of various resolutions Or even in the Editor Game window when I change the resolution My canvas Either gets slit or get gets smaller.... This is because of the FOV ... Can someOne kindly help me on This.....