Why are my terrain brushes not soft?

Hi,

I’m building a terrain but no matter what I do I can’t soften my terrain. In this picture I used the soft brush to add some height in my terrain but it are just hard cirles. Ive also tried smooth terrain but the tool doesnt seem to work. does anyone know how to fix this?

thank you in advance
171685-unity.png

click on the icon to the right of the selected brush. It has a softer opacity. Next, lower the opacity as low as you can and only raise it until you get the desired result.