''Only one window or door per wall segment''

garapoes

I can not place windows in the upper circle because of the windows in the lower circle. Why is that? It's not the same room or 'segment'.

rosemow

You may be best to post about this on the Build Mode feedback thread, BryonyRae may be able to help you there
http://forums.thesims.com/en_US/discussion/787346/build-mode-feedback-for-ea-now-testing-patch-6-19-18#latest