Another one living in NL.
My kids are two full days back and three fullish days home ed. They're at a school that's international but bound by Dutch regulations (not all international schools are - some are totally independent so can choose what they want to do regarding reopening).
We live opposite a park and it was busy throughout lockdown. It's a neighbourhood park so kids from age 6 are often there alone if their house overlooks it. Parents who went socially distanced.
The schools are all divided BUT outdoor sport clubs - and any sport that could be moved outdoors - started two weeks before for under 12s. The sports all practice social distancing between adults - parents not allowed to stay and watch either - and kids are socially distanced from instructors. So, DS plays football. His team has kids from a few different schools. There's another boy on his team from his own class..who is in school the days DS isn't. This to me means that the school separation is a general guide but not intended to be hard and fast. I mean the parks are all still open after school, so likely that kids who are in different groups are still mixing.
My kids' teachers both have face masks. Dd6 says hers only wears it if she needs to come close to them. Her teacher sent a photo before school started and it's some kind of professional one with a replaceable filter - no idea where she got it. DS8 says his teacher only wears hers (disposable) if they're walking through school.
School made a video of different classrooms and the hallways which was sent to parents & kids. Lots of the classes have a horseshoe shaped layout with the other group's desks used as spacers, so kids only use their own desk. Some had rows. Some classes had a line of desks (instead of a line on the floor) barricading the teacher in to the front! Some classes had little pockets on a notice board with each child's name on so that kids could leave notes for their friends who were in the other group.
From what I can tell, my school divided the classes in half by those who have siblings, starting from the oldest class and working down. So Group A generally seems to be those with siblings/siblings in higher classes.
Both my kids' teachers also sent pictures of the class (one had been in the video as well).
The school surveyed the parents about who planned to send their kids and shared the results. It also asked about main concerns. About 90% planned to send their kids and 1% were not sending them because they didn't want to - 9% were due to health/shielding issues. The main concern people had was hygiene.