Child theme nav options not working in Studio

I have the latest Studio theme installed and I seem to remember some information about the restructure of the folder directories etc.

At the moment I have installed the Studio theme and moved the Child theme out of the sub folder to a parallel folder under themes so it is picked up by the wordpress install. I have selected to use the child theme.

I only want to make one change via the custom stylings to the navigation background hover colour but this does not seem to take effect on the site.

Do I need to set the child theme up in a particular way?