Billboard size is too big and i cant change for Landscape splines

Development World Creation
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1

Billboard size is too big and i cant change for Landscape splines ?!
And there is no settings about it .

2

There’s an option to change billboard scale. To edit splines just right click on them where you want to place a spline point.

3

There is no rendering options .
Just have 3 options ;
+Landscape Spline
+Landscape Deformation
and Mesh