Search results folder are call Link Folders and are stored in the home mailbox directory as LNK*.PNL files.  You should be able to use a file explorer to navigate to your home mailbox directory and manually delete these files.  You may want to just move them out first, then delete them once all is well.  Be sure Pegasus Mail is closed before working in the home mailbox directory.  A backup of the home mailbox directory before manipulating files in it is advised.

I know about the delete on exit setting, but when I moved Pegasus to this new PC, it wasn't set for awhile. So I have a ton of search results folders now, and it appears that the only way to delete them all ( they won't delete on exit ) is one at a time, WITH the verify button.

Is there a faster way to do this, please?