Freezer works fine - refigerator is set on lowest setting and completely freezes everything in it

If food in the bottom of the refrigerator is freezing, this could be caused by a refrigerator not having enough food to absorb the cold air. If food in the door is freezing, move the door bins up or down so they are one notch away from freezer vents. The fresh food control should be at the normal setting of 5.
https://products.geappliances.com/appliance/gea-support-search-content?contentId=20492

https://removeandreplace.com/2016/08/03/refrigerator-is-freezing-everything-what-to-check-how-to-fix/

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I would guess it's the fan in the freezer compartment that's bad.

THIS REF. WORKS BEST WITH THE REF. SET ON 4 OR 5 AND THE FREEZER AT 2 1/2 OR 3. HAVING A HIGH FREEZER TEMPATURE CAN HAVE FREEZING IN THE BOTTOM DRAWER OF TH REF. MAINLY BECAUSE OF THE RETURN AIR VENT TO THE FREZER IS BEHIND THAT DRAWER.

just look for a better fan to buy to prevent the compressor from having problem . thanks.

Seems like you set it at the lowest as you mentioned, try the recommended setting. The lowest is the coldest, that will freeze up your food items.

it may be possible. Turn the temperature on the lowest setting and see what happens. If it still freezes everything up then it is not posible. If it doesn't freeze everything , then check the temperature with any temp probe. It should run at somewhere between 36 and 38 degrees. This is the normal cool setting on a refrigerator.

you just need to clean the coil located under the fridge

Probably need to replace that temperature control. Also check damper. If manual, set to where less air is going to fridge.

your thromstae is bad

Your baffle that controls the freezer temperature is possibly broken.  If you take the cover off the dials labeled "refrigerator/freezer" the baffle is a plastic arm that controls the amount of air circulation between the freezer and the refigerator. If the arm is broken is will stay closed completely blocking the air hole or vent.  I just wedged a small piece of wood or shim in mine and it hasn't frozen up since.

Good Luck.  I know how frustrating it can be to repeatedly defrost the ice build-up.

Mary Lynn, Alabama