To open a toolbar...
Weld
Remove creases from a mesh by merging coincident mesh vertices.
Unweld
Add creases to a smooth mesh by creating coincident vertices.
WeldEdge
Remove creases from a mesh by merging coincident mesh vertices along selected edges.
UnweldEdge
Add creases to a smooth mesh by creating coincident vertices along selected edges.
WeldVertices
Remove creases from a mesh by merging all selected mesh vertices.
Rhino 6 for Mac © 2010-2019 Robert McNeel & Associates. 16-Jan-2019