How do I set object to stay in the middle of the cur. screen

I'm using WindowWitdh/2 but it always send the object to the middle of initial screen. However, I need to send it to the middle of the current screen. I've tried both window and layout witdh, can't find one that says "current screen"

set its position to scrollx and scrolly

QuaziGNRLnose

The same thing happens :/

Edit: it's working. Thanks bud