Following this tutorial for rigify addon I've achieved a rigged human model. It work fine when I grab the handlers that are shown in this picture:
From a certain point, without knowing what exactly I have done, the handlers disappeared and the armature has taken on the conventional look:
The elements generated by rigify addon are complex. There is a metarig and a rig, each with multiple layers. I have tried to activate all the layers in both objects and operate with them in the different edition, object and pose modes. I haven't been able to get the handlers back. How can I recover the view of this handlers?
This is the file, if needed for review.