Landscape Texture Painting not smooth

Hello,

I want to paint a “forest way”… For this I need to paint different textures on my landscape.
But if I paint something like dirt on my landscape, it’s big and not smooth.
Here you can see what I mean: - YouTube
I want to create smooth textures if the way changes the direction.
Has anyone an idea? I am somewhat new at UE.
And sorry for my English, I am from Germany

Thanks!