Organising Mail folders

In Mail on my MBP, my email folders are organised by type. So I have:

Inbox

Email account 1

Email account 2

Email account 3 etc

Sent

Email account 1

Email account 2

Email account 3 etc

and so on,

Then I have

Email Account 1

Folder 1

Folder 2

Folder 3 etc

This to me is logical and how I would wish it

However on my iMac, I have

Email Account 1 Inbox

Folder 1

Folder 2

Sent

Junk etc

and for the life of me I cannot figure out how to change the iMac to match the MBP. I am clearly having a senior moment, but could some kind person point me in the right direction.

Thanks