Grid View For Single Category and Single Author Posts

Hi,

This is probably a question with an obvious answer, but I don't seem to be able to find the solution. I am using the (Posts) Grid Layout on the front page of my blog, which is great. However, I can't find the setting to use the grid layout for a single category's posts view or for the single author's posts view. How do I configure the blog to display in this way?

Thanks,
Steve