Almost half of my emails tagged as "Important" since emClient 9

Since I updated to emClient 9 Pro, about half of the emails I receive are tagged as “Important”, which is not only not helpful, but quite annoying. How can this be disabled?

Thanks! It doesn’t change the tags on existing emails but I guess this will do on new ones?
I don’t get why this feature was implemented in the first place, how come an email client can know what message is important for us (I don’t even know myself…)? This should be disabled by default, showing most emails as important makes no sense!