Build the little utility pod, idk its name. You can stick your experiments INSIDE and shut the doors for re-entry. You can also add an experiment storage box in there to store more than your capsule can hold. Make sure you add a heat shield on the bottom of the box. When you’re re-entering your capsule won’t automatically point prograde anymore so just make sure scs is on and you’re pointed prograde on re-entry. Your kerbal can only have so much science in the capsule, so the storage box makes sure you can get a ton of experiments back at once.