How to change the size of trees?

Tell me how can I increase the size of the trees that I place on the terrain using a brush? There is a size setting for them inside the brush, but there is a maximum of x2.
I tried changing the size of the tree prefab itself, as well as the factor (I forgot which one when adding the tree to the brush). But in the end, the most that changed was the size of the billboard tree at a distance. But the 3D model itself never changed. What should I do? I want to enlarge the model by about 4-6 times