What determines where [Expand] Expands to?

Hi.

Today i tried out the expand feature for the first time and i really like the concept of it. My main issue with the Live Table (flexied to Show) is that there's never enough space to see all relevant Channels.

I'm having a bit of a hard time understanding, what determines, where Expand Down expands to. 

Here's my current monitor setup. When i try to expand Tab 2 (Monitor 3) down, it expands to Monitor 5 and then Monitor 4.
If i Expand Tab 1 (Monitor 4) down it will expand first to Monitor 3 then 5.

Right now, my preferred arrangement (Monitor 3 expanded to Monitor 4) seems impossible to achieve. Can someone explain how this is supposed to work?

Thanks. 

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