I have never tested that before, but I don't think you can enter an address that doesn't belong to your own wallet there. Someone correct me if I am wrong, please.
I just tested it in testnet4 Electrum and it accepts any address from other wallets.
I don't know what @3robins meant by "
pre-script" though.
7. Fifth question... When the sweep window auto populates the wallet address and defaults to the first address from my list of 30 addresses within my Electrum wallet (starts with "bc1") there is no pre-script before it, so my friends address that also starts with "bc1" shouldn't need a pre-script either, correct?
Are you talking about the advanced transaction preview?
If so, that'll show after you click "
Sweep", it wont automatically sweep in that first Sweep Window.