Moving messages - restriction

Tried to move several messages, and the folder heirarchy was such that I was 
unable to move the messages.

I selected the messages to be moved, then the 'move to', selected the folder, 
and then searched through the sub-folders, for the destination (sub) folder.

But, I could not see it, there were 4 columns showing, and the (sub) folder I 
wanted to move the messages to, couldn't be seen. I tried the mouse, the right 
arrow, etc, but could not see more than 4 columns of sub-folders.

Any workaround for this please ?

Peter