SpamSeive 3.0.1 not working at all on Apple Mail Ventura 13.5 Apple M2

You checked that you are getting green flags on the good messages in the inbox and that you don’t have a large inbox? At this point, the best solution is probably to update to the beta, though.

SpamSieve has a Window menu.

Apps do not have menu bars when you set the Dock icon to be hidden.

If you disable the plug-in, the training commands will be in the SpamSieve menu bar icon.