Issue when rendering a custom water shader created with Shader Graph

Hello!

I recently started with the URP and the Shader Graph tool because I need to optimize the water of my scene. After two very long days, I have achieved a results that looks like pretty well!! However, the shader is rendered with a very poor quality when I play the scene in comparison to the Scene Tab. I have tried to modify the URP options, the camera option, the default directional light or even the lighting settings but I cannot found the reason neither the solution. I attach an image where the differences are clearly distinguished.

Thank you in advance for your help.

The first thing in creating water is to have reflection
Here is a simple video about the general work, and you can put it in the urp or get ideas: