Select an object to manipulate.
Open the Contouring tab ②, select Brush 2D ③ and then select Brush ④.
Use Brush to expand the object’s shape and Erase to shrink the shape.
Scroll to the next slice and repeat step 3 until the object has been modified in all relevant slices.
This is necessary because Brush 2D only applies the object modifications in a 2D plane.
Once the object’s shape has been manipulated as desired, deselect the object.
All modifications will automatically be saved.