Another method to keep a panel from rattling in a frame but still allow it to expand and contract is to use foam rubber in the grooves (see drawing).
Putting foam rubber in the grooves keeps the panel centered, and when the panel expands, the foam compresses.
I've found W'-wide foam weather-stripping tape with an adhesive back fits perfectly in a W groove. And you can build up as many layers as you need (Just be consistent so the panel stays centered; see detail).
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