Smoothing hard edges on Meshes, ProBuilder

Bevel Edge, ProBuilder

Let's Learn Blender! #5: Smoothing & Hard Edges

Unity Probuilder : Smoothing Tool

Shape tool, ProBuilder

How to design a simple level using Probuilder in Unity - LogRocket Blog

Smoothing — Blender Manual

ProBuilder Unity, Smooth Object Tool, Make meshes look smooth without adding subdivisions using the Smoothing tool in ProBuilder and Unity. This is a FREE asset within Unity itself. Full

Bridge Edges, ProBuilder

ProBuilder Window, ProBuilder

ArtStation - Basic Tools and Hard-Surface Modeling, Part 3: Rerouting Edge Flow