Although Electron applications are technically running inside an embedded browser, they are not treated as a browser application by Commander.
If the default set of gestures / actions need adjusting for an Electron application, it's best to add the application to the Application List and set up the required gestures and actions.
Recent versions of Commander can now see UI elements inside of Electron apps, so the default gestures that come with Commander will work reasonably well inside of Electron apps, and it's possible to customize them on a per UI-element basis as required.