Hi Nandu,
We use this format across the board for different integration points that is why it stays this way.
Currently there isn't a way of getting the data in a single tab.
Now coming to your need of creating an agreement in ECC, are you aware that we are building this as a standard integration in 15s release? With this standard, out of the box interface you can directly create an OA in ECC from an Ariba Contract. Let me know if you need further information on this
Hari