With 1.35, the chaincode is not related to the root key. This is why it is added to the backup string. With 1.35c, the chaincode is a HMAC of the root key, therefor only the root key is necessary. The Wallet ID is derived from the first key pair, which is computed from the root key and the chaincode. Different chaincode, different ID, different address chain.
In Bitcoin, you spend whole coins, which is why there is a change mechanism to begin with. This dialog is telling how much in coins are being used in this transaction. From your perspective, it doesn't mean you're spending that much (since you're receiving coins back in the change output), what it means is that this much value is tied up in this transaction.
Think about it terms of cash. If you're buying a $1 candy bar with a $10 bill, $10 is leaving your wallet. Your $10 is tied up in the transaction to buy the candy bar. Once the transaction is over, you're getting $9 back in change.
Time to find a turkey sammish hmm