You have misspoken in your reply to furnituresuppliesuk.
You do not make the change in the “external links” setting. It’s in the EXCEPTIONS setting.
In the future, it would be far more helpful if you provide correct information so that your customers are not confused and trying to sort things out in the wrong area.
Please give further explanation as to what settings we use in the external links page so the menu is not fully broken. There is nothing obvious in there, and I’m not comfortable just checking and unchecking willy nilly to see what works and what doesn’t.
Simply saying “you have to exclude some links from being affected” is very vague.