Fillet surface change?

I made polysurface and filleted inside corner to R10 now I have to shange it to R20. How can I do it? Rhino5 Mac

Screenshot 2018-11-01 at 12.37.55

Assuming it is a flat extrusion: copy the edges of the front face, delete the polysurface, explode the copied edges, delete R10, create R20, select the revised edges, extrude as required.
No quicker way that I know of.

Maxz has given good advice. Unfortunately there isn’t an instant way to do it in v5, the modification needs to be done manually. However, it’s a pretty quick process once you get the hang of it.

Is there another way incase there is no flat detail.

If it isn’t flat, I would use Explode to break down the polysurface. Then delete the 10mm radius surface and create a new 20mm fillet. Next untrim the two “flat” surfaces, retaining the trim curves. Then intersect the new 20mm surface (use extend if necessary) to generate a new trim curve. Finally retrim everything and join it back into a polysurface.

Should take about a minute once you get the hang of it. Good luck!