Charity site seeks your help please – full width template issues

Hello all – I am trying to build a charity’s website in wordpress for the first time, and I am getting there but stuck on the full width template issue. I have searched a lot of forums and tried a lot of things but am still stuck. Basically, I am using the Twenty Ten template, created a child theme, but I can’t seem to make the full width option work. It still leaves the space for the sidebar???

Its driving me mad as it is screwing up my gallery section too and everything is looking left heavy.

Please can anyone take a look and tell me what I am doing wrong. I really want this site perfect as they work they do in Haiti is unbelievable and they deserve a great site!

Not sure what information I need to give you but the site is currently under https://www.photocreative.co.uk