All the faucet handles I've seen of that type can be tightened by removing the very small screw-hole cover with a finger nail or the edge of a butter knife on the bottom-front side of the handle, which may be a red/blue temperature indicator symbol, then there will be either a very small screw (use a pocket-size screwdriver), Allen head screw, or Torx head screw. Once the screw is tight all should be OK.
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