Not receiving recent Figma updates (UI3, Slots) on both main and beta app

I noticed that my Figma app hasn’t received some of the recent updates such as new left navigation bar and Slots for components.

I’m using the desktop app, and I also tried installing the beta version, but the features still don’t appear in either version.

To troubleshoot, I also reinstalled the application, but the issue remains the same.

Are these updates still being rolled out gradually, or could this be related to account permissions, region, or workspace settings?

Thanks in advance for your help!