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That's what I've heard too.
Electrum (client) doesn't leak your xpub to the Electrum server it connects to, and I'd assume neither does Sparrow.
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I found this to be helpful: https://sparrowwallet.com/docs/best-practices.html
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Wallets do not send the xpub directly to the Electrum server.
Correct, my mistake, I didn't explain it exactly, just trying to make the connection by saying "it sends the xpub".
Here are more technical details:
https://electrum.readthedocs.io/en/latest/faq.html#does-electrum-trust-servers
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Wallets do not send the xpub directly to the Electrum server. Instead, they derive the addresses (--> script hashes) from the xpub and then request the balance for each individual address.