New to rigify. Rig is generated, can be animated but is now invisible

In the blend-file You can see my (truly not beautiful) character which is animated. But now I can´t see the rigify rig and its manipulators. What did I wrong?
Nikolaus.blend (2.6 MB)

Which Blender version was originally used to generate the rig?

Opening it up in v4.0.1, the controller bone groups aren’t hooked up to the rig UI buttons. Re-generating the rig from the metarig in that Blender version hooked everything back up, and the animation looks ok.

Once the rig has been re-generated, you’ll need to select the Action again to make it active.

The Blender version was 4.01. Your tip to regenrate the rig seems promising. I´ll try!
Thanks
Update: it worked!