When modifying the cave generation settings with datapacks, there seems to be an option for the minimum depth at which a cave generates but not a maximum, the files I'm looking at are located at data/alexscaves/worldgen/structure/ these have a section like this:

"start_height": {
    "absolute": 0
  }

which seems to allow changing the biome's start height, but not the end hight, so on worlds with sea levels lower than y 63, the caves break through the surface a lot like this:


I've checked in the config files too and there dosn't seem to be a way of changing this in the generation settings there either, unless I'm missing something! - but I don't think I am as I've looked through all the files I can find!