Big gap space between Author & Post?

[webking]

I don't understand why this is showing a big space gap between the Author and the Post body column.

See attachment if you know what I mean.

How can I correct this? Thanks

[Tanks]

I think that is called white space and make the website easier on the eyes ?

[webking]

which file to edit because I have a small width for  the entire forum. Thanks.