Canvas not scaled right

I was doing a game-like app and I noticed something. The canvas on my phone is bigger than the canvas on the designer. How can this be fixed???

The designer gives a representation of the layout, you have to test on devices (companion or compiled app) to get the true look and sizing of the app. Are you using responsive sizing? Have you set the canvas to pixel size or automatic/fillparent/percent sizing ?

I'll test it