Alignment center of the decrease collision box size

[beakartJs]

I can't find the correct method, so I have one question. 
If I decrease the width of the sprite for example - from 48u to 32u then collision moves by 16u left - how could I center (align) the collision? (8u to left and 8u to right)

this.sprite.body.width = 32;

 

[beakartJs]

I mean something like this: https://pasteboard.co/Iwk1y1n.png

Anybody have an idea?

[beakartJs]

I found, offset:

toolsGame.mainElements.player.obj.body.offset.x=8;