![](https://www.versluis.com/wp-content/uploads/2023/05/image-800x450.png)
Scaling a HDRI requires the same node setup as rotating a HDRI in Blender:
- feed a Texture Coordinate node into a Mapping Node
- set it to Type Point
- scale on the Y Axis
![](https://www.versluis.com/wp-content/uploads/2023/05/image-1.png)
You can scale on both other axis as well to expand the HDRI horizontally and vertically, but overall scale is achieved just with the Y axis.