This is taken from the guide, you can download on the MG homepage:
<<<EV Mode
In the "EV Mode", the vehicle will be driven by the (electro) motor
preferentially, and the instrument pack interface will show
" EV ".
Note: In this mode, the vehicle can still start the
engine in due time according to the actual working
conditions, and the instrument pack interface shows
" HEV " at this time.
Intelligent Hybrid
In the "HEV Mode", the vehicle starts the engine in due
time to drive the vehicle according to the actual working
conditions. The instrument pack interface shows " HEV ".<<<<
The batteries are not loaded while the engine runs. If you are in HEV mode, both the motor and the engine are running. From 120 km/h the car turns to HEV mode.
When the vehicle is in braking or coasting state, the
energy recovery function will be activated, and the motor
will convert part of the kinetic energy of the vehicle into
electric energy,