The theme I’m using right now, Rainforest doesn’t appear to have a “full width” template available when you go in to edit a page. I see on a few other common themes, like twenty fifteen, twenty sixteen, and twenty seventeen, that option doesn’t appear to be available either, so perhaps it is not very common?
Probably there are a few other ways to achieve this. Rather than my providing a link to the page which is very much still under construction, could you perhaps suggest some other general approaches? No need to be detailed about the steps involved – I can research these separately. I’m interested in a couple of overall approaches to achieving this in a robust fashion. Thanks so much!