When rounding edges with the Round Vertex option, you can enter setbacks in the Inspector Bar. The setback is the distance from the vertex to the point on an edge where the rounding begins.
Setbacks are visible at vertices where all edges are rounded. The setback value must be greater than the edge rounding radius.
If no setbacks are used, the rounding extends along the entire edge.
If setbacks are used (entered in the Inspector Bar), the rounding starts at the specified distance from the vertex.
Note: If the setback values are different, where they are applied depends on the structure of the object itself. You may need to experiment to get the desired result.