events shown, though no post category

I use The Event Calendar with Hueman. The problem is that future events appear in the front page that is set for displaying the last posts + 5 features posts in a slide.

I’d like to show only real posts, no events, but can’t discover how to excluse events.
If there were no other option, I would be okay if the events were visible in the featured-posts-slide only.

Problem is that in Customizer –> Front Page Content–> ‘Select a category to feature’, the events are not visible in the dropdown with categories.

I have no idea if this is an issue for Hueman or for The Events Calendar. I hope someone has a solution.