How can I create a new address in Electrum wallets? By default, the addresses are defined in the wallet.
The addresses are generated from the seed. Addresses are not linked to one another, other than them being linked by the seed, master private/public key.
Can not I create new addresses myself?
You can import an address yourself. However, you need to create a new wallet. Electrum only allow users to create a new wallet and import from there to prevent users from losing Bitcoins.