I was taught that
no gesture is prescribed for the lay faithful in the Roman Missal; nor the General Instruction of the Roman Missal,
thus any instruction of how to gesture during the Our Father from anyone other than the Roman Missal in not authorized.
However, the holding of hands can symbolize a community, but this should not take place until AFTER communion, thus holding hands during the Our Father is not preferable.
I went to an English language Mass south of the border. There are a lot of retired Americans living in that beach community. Before the Mass starts the congregation is instructed to hold their own two hands together palm to palm during the Our Father. It is the bishop who made the decision.
This started with the Charismatics in the 80s.
I was taught the hand holding was extraneous to the Mass, not approved, that the communal act is clearly in the one Holy Communion, befitting the movement of the Holy Sacrifice occurring at the Alter, to our reception of the Eucharist.
The unchecked creative gestures instituted by the laity is out of hand, and due to the deplorable laxity of priests to teach proper postures, has increased to now the laity taking over the priest’s orans posture.
Priests are flattering their flock and piety is suffering.