They count and would have to close the doors after 100. They have every other line of pews closed and you have to sit 6 feet away from others unless, families can sit together.
We are in the Diocese of Las Cruces. The other dioceses in the state may not be open. The diocese has been having mass from our cars since after Easter but the bishop did the Triduum at Easter.
I'm not sure, but I think that's the way it is all over the Country, with each Diocese developing their own rules, and each Church within each Diocese developing their own system within those local Diocesan rules. Some of those designs are better than others.