The icon menu has been envisaged to be positioned on the right of the content in the theme, so there is no back-end switch to place it instead of the header. If you need customization services, I can recommend Envato Studio as a place to find skilled WP professional freelancers at decent prices.
Regarding your second question – could you please clarify what you mean by expanding/collapsing the tiles? Providing a direct link to a URL which features implied functionality would also be terrific. Thanks!
Regarding the second questions, one example would be this: http://www.360i.com/work/
Just click on one of the works and you can see that the relevant content opens in another div at the top of the page. So I mean, something like that ….
I’d also like to ask you if it is possible to upload .svg icons to the site? When I tried that I got an error. Is there actually a way to upload svg instead of regular image icons?