First, you made a bunch of the internal wall faces after which drew the rectangles for the home windows outdoors the group. Earlier than including the rectangles for the window openings you must open the wall group for modifying so you possibly can add geometry to change the partitions. The opposite factor you’ve achieved is put the internal wall faces in a bunch inside a bunch that comprises the outer wall faces. With that association for those who put the rectangles for the home windows contained in the internal group and push them by, the outer faces received’t get reduce. Seems like the simplest factor to do for the time being is to blow up all the teams, reduce you openings and repair the face orientations. You should not have any uncovered blue faces.
Notice you’ll have some bother with the home windows I present chosen, beneath, as a result of the within and outdoors faces of the partitions aren’t parallel to one another. They in all probability must be fastened to make them parallel.