Hey, First of all, welcome to Game Development especially using Unity! We hope you will have a great time developing awesome games!
Secondly, using our shader assets is pretty easy..... just make sure your project is using URP, then just drop our shader material to any of the sprites you want to act as a distortion effect. That's all. The settings to tweak the effect can be found on the shader itself to get the right feel.
Hope this helps.
and I have not found a way to fix this.
I encounter the same problem when I put the ground sprite below and the Distortion Sprite on top, whose material is the Distortion Shader material. But the sprite looks grey and shows no distortion. I'm using the URP 2D. Any ideas?