Forget the wallet type, all of those support Opt-in RBF and your transactions are automatically flagged to be replaceable.

If you're looking for the settings, there are small "tool" icon [] in every nook and cranny of Electrum.
Each containing options related to that where it's located.
For example, in the upper-right corner "Send" tab, there's the setting icon containing the 'send-to-many' and other invoice related options;
After you click "Pay...", in the "New Transaction" window, there's a setting icon containing transaction-related options.
You wont find RBF anywhere though but it's enabled by default.

If in doubt and to make sure that you're actually using Electrum, just verify its signature.
Follow this tutorial: bitcoinelectrum.com/how-to-verify-your-electrum-download/