Is it possible to control and make changes to the existing preloaded patches of the Code App via the USB port connected to a Windows 10 Laptop?
or the Marshall Gateway App works only with Android/iPhone via Bluetooth?
No, Marshall Gateway App does NOT work on Windows.
There is a third party software you can find here: https://marshallcode.tools/pc-editor
On the other hand I still don't understand why Marshall Team focused on mobile app, instead of descent PC program...