How to change scale of Material(Textures) on a Terrain?

As in the Picture when I Generate a Terrain with some Specific Material ( I Used the Open World Demo kit Materials)
The Textures become very small compared to the Scene !!
Is there are any way to Rescale it without deleting the whole Terrain ???
because I have edited the hills and Heights for hours !!

you can change it in material I think. open it and find node like “Landscape Coordinates”, and try to edit values in it.