Any Zwifters out there?

I have a 'zwift cog' rear wheel trainer with a electronic button for shifting gears. Should the front be on the big cog or little cog, or it doesn't really matter?
 
I have a 'zwift cog' rear wheel trainer with a electronic button for shifting gears. Should the front be on the big cog or little cog, or it doesn't really matter?
Doesn't matter but big ring is generally smoother for chainline etc
 
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