Customized hotkey

Hello everyone. My first post.
I try this afternoon blender. I usually have control+S reserved. So assign to save a file to Control+G
All goes well, except for the fact that this hotkey continues reserved by blender to other task.
i think blender has to warning about the prior existence of this combination, but doesn’t in my case.

Is it correct and what can I do ?

Best Regards

Is it correct and what can I do ?
You’ll have to change the shortcut for ‘Create a New Group’ (Ctrl+G) or change Save a File to something else instead of Ctrl+G