I read few articles that said it's not possible to turn off the wallet to generates new address, so you can only save or track your funded address through explorer.
Electrum generates new addresses within the
gap limits. You can choose to change that limit if you want to, but if you only want to be receiving bitcoins through a particular address, then just keep sending that one to whoever is sending the bitcoins. It undermines privacy, but does not pose any wallet risk.
- Jay -