@bernardcu
The request of @chrismillard is not what you said !
You want Windy to let you view weather layers at higher zoom levels instead of showing the base map. But due to the resolution of weather models, you won't get more details in the weather layer.
Here is the the wind forecast of HRRR model with a 3 km resolution, the highest in Windy for the US (with customised color scale).
8C3647DA-6710-42FF-B228-6C9E5977E789.jpeg
Do you think the same picture at higher zoom level would give you more details?