Capture NX question ?

Hi
I have been using it for a few years now, but sometimes loading up:-

The folders widow shows the directories list and highlight on one being used

The vertical windows are in 3 panes, two on the left and the thumbnail browser on the right.

The only way I can find to horizontally enlarge the panes is with the centre column, so I have either:

the Folders showing and about half width thumbnails, or
the Thumbnails showing and very little of the directory listing

Is there any way to widen both?

I hope I have explained it okay?

Thank you so much for any help - very frustrating - I thought I could work PCs fine ?!

Al