The car itself is surprisingly nice to drive. Smooth ride, solid feel, and it steers and handles really well.
Tell me something I don't already know
I love this little bugger !!
Sport mode is my usual one, the accelerator pedal travel is shorter, car performance are the same as in Normal. Mountain mode you discovered its purpose. Hold mode is to keep battery for later use. Normal is what it is.
You can choose either low braking regen level with shifter in "D" position, or higher regen in "L".
If slippery, keep it in "D" to avoid hesitation between regen and ABS friction brake.
Unless specific needs (mountain, hold mode), it is up to you between D, L & Normal / Sport. Enjoy !!