meeshroom

Hi! I'm a total noob here and am totally addicted to this software. I've spent the past day building a house and am stumped as to how to increase the size of my walls to accommodate the large windows I'd like to use. I've watched a lot of videos and have gone into object settings, but still can't seem to figure it out. Thanks in advance for your suggestions! I've attached a screenshot so that you can see how the windows are poking through the roof! :-/