Monstera cuttings can be rooted in water or in damp soil. The one you have in water looks like it has roots about big enough for it to be moved into a small pot with a porous potting mix. Make sure the white roots are covered lightly with damp potting mix, but keep it snugly potted. It will take time for the roots to transition from water to soil, so be patient.
The one that is already potted is still making the transition to soil so it is normal for it to lose some lower leaves. Let the top inch of soil get dry to the touch before watering it thoroughly.
More leaf fenestration will occur as the leaves mature. That is not something you can control.