Hi @Fabian Metzner Welcome to the community!  We don’t collect any information that isn’t submitted on the form, so it isn’t possible to see who viewed the form if they didn’t submit a response. 

Though, in the Results panel, you can see who answered the form. If you’d like to know who they are specifically, you’ll want to add a name or email question or pass the information through hidden fields. 

If you have any other questions we can answer, please let us know! Happy to help.