Thank you. I'm familiar with the fact that new addresses are generated each time but I thought they were all underneath a single umbrella address (same private key) and would therefore show as a single balance.
No. A new address is generated every time you want to receive Bitcoin and each address has its own Private Key. You can use the same address multiple times. But that is bad for your privacy.
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I advise against using xPub on Block Explorers. This gives them the information you are the owner of all these addresses. If you are using Electrum SPV (light) mode and importing the xPub, you are now giving this information to one server. You are already giving this information to Ledger's servers and I suggest you give it to fewest amount of Block Explorers possible.
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Regards,
PrivacyG