2.8x] Crease option for Subsurface modifier. — Right-Click Select
Keep sharp edges on plane when using subdivision surface - Modeling - Blender Artists Community
How to keep sharp edges with subdivision surface modifier. Blender tutorial - YouTube
How can I remove these sharp edges? Adding another loop cut just adds another sharp edge, and alters the shape. It's a cube with a bevel and subdivision surface modifier on Blender
Let's Learn Blender! #5: Smoothing & Hard Edges - YouTube