I’m pretty sure that after lots of new schools had built open plan schools, new studies showed that that were actually a bad idea.
I worked in an open plan school for many years, and as a teacher I felt like I had to constantly monitor the noise level of the kids, (little 7 year olds), so as not to disturb the other classes.
I couldn’t do a fun science experiment that encouraged excitement and discussion while the other classes are trying to do other things such as literacy or numeracy.
The poor kids couldn’t express their excitement. And it’s also terrible for children with ASD who can be easily overwhelmed with the noise in a class, let alone 2 or 3 classes.