free the menu width - everything goes to two lines

you can see that the menu below is split. and there would be plenty of space for it to be on one line. 

i've tried pretty much everything to find where to control the menu width and have no solution. even all the custom css injections on the forum does not work 😕 

anyone have a help for this? 

site in action www.fere.fi

thank you that fixed my issue! 🙂