Outlook Shared Mailbox, Organise in Columns?

Good afternoon,

I have three emails in my outlook, currently listed on top of each other in the left navigation pane. Each mailbox has multiple folders and I have the scroll to see them all. 

Is it possible to organise these in columns rather than on top of each other So I don't have to scroll anymore? I appreciate it will make the mail preview window smaller.

Regards, James.