By splitting things down.
Side by side or french doors.
Virtually all side by side refrigerators are the same design.
Typically the right segment can be used for cold storage and the part on the left can be utilized as the freezer.
A side by side fridge has two full length doors that open out and away from one another.
The freezer as far as we can determine is always on the left and the fridge is always on the right.
French door fridges are on the upswing growing in market share each year.
However more space is allocated to the freezer leaving around 25 less space for the refrigerated section.
A side by side will give you more interior storage than a comparable french door model about 20 more.