Well, there's no "plus" next to receive.
I installed Electrum, ran it and created a new wallet when prompted. In the receive tab, there are the headings "Address, Label, Balance, Tx".
I closed Electrum, deleted the wallet (nothing in it), restarted and created another new wallet. Now there are 5 receiving addresses (and 3 change). Still no "plus" though. Should it be there?
It shows up as a down arrow on Linux. When you click it the addresses collapse under the receiving heading. Click it again to show the addresses.