Hi @Bastian_Foerster Thank you for reaching out!
It is currently not possible to copy a form from one project to another. You would need manually do it for each project and as it it stands, it is only possible to have one Form per project.
There are two popular threads requesting these functionalities. In case you haven’t yet, I’m listing them below and I would encourage you to add your comment and vote.
Apologies that I can’t be of greater assistance here, but I hope this gives you some clarification on the topic. Have a great Wednesday!