How to do this header bar

Thanks Tom, I do understand tabs, but typewriters didn't have centre
tabs ( :wink: ) so those have still got me a bit confused.

Nope, no extra spaces or anything messing things up. I've played
with it extensively (in case you've got me wrong, I've been a
professional programmer for nearly thirty years) and I can get it to
do, mostly, what I want, but it still seems (to me) that it's not
doing what I'd expect the name to suggest.

Mark Stanton
One small step for mankind...

Hi. Try placing a tab in the middle of a line on a blank page. A little 'L' shows in the ruler at the top to indicate the tab stop. Right click on the 'L' and you should be able to change it to centered (an upside down T).
Now if you tab to that tab stop and type some text it centres about that upside down 'T'.
steve