I have used Spamsieve successfully for some years on macOS.
I just reinstalled Spamsieve 2.9.41 on iMac with newly installed macOS 11.1.
I installed Spamsieve in Apple Mail and Airmail 4 following your instructions.
However for both apps, when I open either Spamsieve insists on opening 2 windows…
Statistics and Welcome to Spamsieve.
Please advise how I can stop this.