“I seem to be able to get rid of the side bar by either going into Woocommerce and making my page full width or going onto my own pages and doing pretty much the same”
That is the best way to remove the sidebar. There are no other ways beside adding CSS code.
As to the location of where to decide what gets shown in the side bar there are two ways to do this:
- go to the customize page, click “Widgets” at the left side of the page, click “Sidebar”
- from your dashboard select “Aperance” -> “Widgets”, Locate “sidebar”, and make any changes you’d like
Hope this helps.