Hey, same thing here!!
Kaspersky main window opening on every startup. So annoying.
I have Kaskersky Standard on Windows 11.
I contacted the Kaspersky support and they said it is not possible to stop this window from opening on start-up.
I'm considering installing the previous version ("Kaspersky Anti-Virus" in this case), but I'm not sure if I will be able to use the current license.