@Thomas STEFANI Thank you for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.
Unfortunately, when you are enabling Always-on soft delete on your recovery service vault it is clearly called out that you cannot be disabled as shown below and in documentation here as well.
If you want to disable the below soft delete settings that is enabled on the cloud and hybrid workloads, you can refer to this documentation.
Feel free to reach back to me if you have any further questions on this.