311. Places for the faithful should be arranged with appropriate care so that they are able to participate in the sacred celebrations, duly following them with their eyes and their attention. It is desirable that benches or seating usually should be provided for their use. However, the custom of reserving seats for private persons is to be reprobated.[Sacrosanctum Concilium 32] Moreover, benches or seating should be so arranged, especially in newly built churches, that the faithful can easily take up the bodily postures required for the different parts of the celebration and can have easy access for the reception of Holy Communion.
Care should be taken to ensure that the faithful be able not only to see the Priest, the Deacon, and the readers but also, with the aid of modern technical means, to hear them without difficulty.
I love when the reform2 crowd wrings its hands over participation, retranslating to fit the ideology when necessary. You don’t have to look very deep to get the notion of what the Church intends with the assembly’s participation at Mass. The senses help focus the attention, especially seeing and hearing. Bodily postures are important, as is the reception of the sacraments, especially the Eucharist. Otherwise, great freedom is allowed in how the assembly is hosted in the nave.