I have installed the Nessus security scanner RPM (which I downloaded from the
Nessus website). Now every time I go to yast -> Software -> Software Management
I have to wait there for a long period of time before I can [s]earch for or
install a new RPM again. On that window I can see Nessus, it's size,
description, and "i" which means it's installed etc. I wonder why I see Nessus in there.

My question is how can I remove Nessus
from that window which, I hope, will reduce the time wait before I can install a new package.

Thanks.