WebPlus X5: Navigation buttons - even spread

I am working in Webplus X5 and I have added another page, which has been included in the navigation bar. What has not happened is the last button, contact, has dropped down onto a second line.

I am trying to find out where I can spread the buttons evenly across one line, if possible, without stretching the whole navigation bar.

Any one got any ideas?

Thanks in advice for any help.