Thank you all for the comments, they have helped me to solve my search for this function in the Widex Moment 220 model.
It is unfortunate that the Widex company does not comply with the user manual that it publishes and that accompanies the hearing aids.
I have written to Widex Global and Widex Spain, asking about this issue and they have not answered me.
I called a 900 line from Widex Spain, and I got Aural, they are the Widex distributors in Spain, I asked about this issue and recently, after your answers, they told me that it is only available in the 440 model, but they do not respond to what is written in the manual.
It also surprises me that nobody in this forum is in my situation, that is, feeling cheated by Widex.
I lost my left hearing aid a few months ago and it took me 90 minutes to realize it. That’s why seeing this function in Widex Moment 220 made me opt for this brand, and now I see that everything is a lie.