I get the impression from the first post here that we are not talking CVT belt, but rather the final drive belt on the AK 550.
A CVT belt usually is self aligning in the "V" of the pulleys so obviously no need to worry about that for side to side alignment. Only if a pulley is offset in or out and that's not likely if all the bits are installed right.
The final drive belt on the AK 550 has a clearance tolerance mentioned in the service manual. I looked this up for having the same concern as Quick-Star24. That belt must be at least
1 mm from either side, but otherwise can be anywhere in between. That's about the thickness of the flat prongs on any typical household power cord plug in the USA. The real issue is just so the belt doesn't rub the sides anywhere. If it clears the sides all around then it's good. Mine is also to the outside edge so I measured it in several places while turning the rear wheel to be sure the entire belt is measured on the rear sprocket and I found that it is more than the required 1 mm all around. When I need to replace the rear tire I'll be taking off the wheel myself to take in for the rubber change and will align the belt to center when I put it back on. I've been told by a few dealers that most of the scooters come from the factory that way.
You can see mine in this photo:
https://photos.app.goo.gl/XWcSjwAfKE41cGDS9btw- since this web site only allows very small sized photo files to be attached and because ALL my photos are about 5 times too big due to my phone camera, and I don't want to take the effort to shrink them to retain the resolution I get, I've decided to post links to my photos on my Google Photos page instead of adding the photo attachment. It's easier to drop in a url, or web, link instead... and faster for me.