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Source Ordering

I'm having trouble to wrap my head around how to create a source reordering for the following setup using F6: 

Mobile: 

mobile

Desktop: 

desktop

 

Can anyone help point me in the right direction?

source orderinggridfoundation 6

I'm having trouble to wrap my head around how to create a source reordering for the following setup using F6: 

Mobile: 

mobile

Desktop: 

desktop

 

Can anyone help point me in the right direction?