Here's the one that did it for me. It's a ZS, not a 4, but it's the same.
If you put the left-hand side the other way up, it squirrels away in the footwell better than how he shows it.
Here's another one, in Dutch, but it's an actual MG4. You have to do this if you want to fit seat covers.
I found the actual seat part impossible to get unlatched but the dealer did it for me. It wasn't necessary to take the seat out of the car to get the cover on. But I still haven't been able to latch the seat back down, though it can be sat on. Another trip to the dealer may be in order.