In Houdini 20, I cannot find the "center noise". So how can I do the same thing in Houdini 20 under this condition?

Thanks!

Go to Windows/Asset Manager and under the Configuration change the Asset Definition to Show Menu Always. This will allow you to change the version of the tools to their older ones. In your case you can revert to attribnoise (instead of attrib noise 2.0) in Asset Name and Path part of the sop.

or change Range Values parameter to Zero Centered