How permanente a solution do you want
Personally, I would want to know what's going on and is it going to continue.
Most foundation issues, including settling or heaving concrete, derive from poor backfilling/compacting when the house was built. Thus, long term, if you take quick cosmetic measures, it's going to occur again...sometime.
Your Option #3 (and most expendive) would be getting a foundation company in getting it taken care of properly.
However, personally, we have a close friend who had the same situation in Rio Ponderosa, I put a 60 tooth carbide blade on my 5-1/2" trim saw, took the screen door down, took the door sweep off the bottom, and trimmed a half inch off the bottom. Then, attached a new door sweep and adjusted it when door was installed.
Keep in mind... when the split becomes a hazzard, you'll need to rent a small electric jack hammer and remove the high side of the split, down a half inch or so and at least 6" out from the split, clean it out and use an epoxy concrete patch and level out. Once cured, clean the whole lanai concrete and paint
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