@NAL - Have you cloned one of our example 8th Wall projects? They include an input system to be able to pinch/zoom/rotate the Depthkit asset, which means the end user can determine the size and orientation of the capture.
If instead you’re looking to looking to forego the input gestures and change the initial scale of the capture, I believe you’ll have to do that in the 8th Wall JavaScript code by applying a transformation. I referenced something similar in a thread about asset rotation, but this type of 3D transformation in WebXR is outside the scope of the Depthkit workflow, and instead falls within development in 8th Wall. You may get a faster response by posting in the 8th Wall forums.