home page alignment is out?

Hi Guys,

I like this theme – very cool, thanks. Just a hiccup with the alignment on the home page featured posts is out – I would like it to have maybe 30 boxes if possible, but have it set at 10 at the momoent. Would someone be able to have a look at point me in the right direction?

https://www.graffikki.surenames.co.uk/

Thanks in advance ??