How can I display mega menu items on one line in Dawn theme?

[FavouredLondon]

Hi,

I was hoping someone can help me. I have noticed that my menu items under my mega menu, some are showing on 2 lines. I want these to show just on 1 line if possible:

My website url is www.favouredlondon.co.uk

Can someone please advise what needs to change in the code to get them onto 1 line each?

Thanks