Hi! I assume you mean rancher desktop, right? According to the docs
https://docs.rancherdesktop.io/getting-started/installation/#requirements-1, it doesn't name Windows 11 explicitly. Even though I would assume it to be running on Windows 11, too.
Would you mind to share a few more information, e.g. the rancher desktop version, have you seen any error messages?
From your initial message I assume the installation itself was successful, right?