Can not manage shared space in my sagemaker domain

Hello Guys,

ich chose Identity Center as the Log in method to create my sagemaker domain. But after i created it, I can not manage my space in the domain setting. Instead of that, i only have a group tab. Even if I lauch into my sagemaker studio and create a shared space, i can still not open it.

How can i set up the sagemaker domain, sothat the users asigned in the domain can create and use the shared space?