Editing my Squarespace Schedule / connecting issue

Hi!

I am a photographer and on my webpage www.drohnenrandgebiet.com I am currently trying out the Scheduling feature (I am on trial).

I have added a booking offer (marked green), and would like to get rid of the example templates (marked red). But I can't find a way to get rid of these example blocks, it always comes with a warning "to use this block, start a Scheduling trial or connect an existing account". But that's exactly what I have done.

How can I solve this bug? Thanks.

Martin