Thanks for your replies.
I solved the issue with the ON/OFF switch button of the throttle. It is now working fine. One wire was slightly disconnected. I have to select ‘switch’ in the parameters instead of ‘button’.
I have disconnected the 3-speed switch for now.
There is a temperature sensor with the MXUS and as you can see from the screen shot it shows a 23 C outside so fine but a 104 C for the motor itself! This is rubbish. I have used the motor for 3 minutes maximum and the temperature remains the same and the hub was totally cool! The sensor is not working. The temperature of the FET is 24 C, observed in the extra parameters.
The throttle seems to work as when I activate it, the wheel is spinning and this time the angle motor was found. However for a certain value/threshold of the throttle, the motor stops running and brakes. I have seen a-1300W on the screen corresponding to the regen. The regen seems powerful and I don’t think I will use my brake pads. I can run the motor like that but I must pay attention when I use the throttle to not go too far. it is not really safe.
I checked the throttle with a voltmeter:
When I used full throttle, I get a voltage up to 4.7V between the green and red wire, nothing between the red and black and 0.5V between the green and black. Does it make sense?
Should I change the value of throttle min and throttle max found on the extra the parameters? It tried to change them but the issue remains.
when i use the throttle i did not see any change on the value of the parameter #throttle. I was expecting some voltage rise.

Any ideas?
i dont really want to open the hub motor to check the hall sensors inside.
Yes I found this manual online but there is no chapter on troubleshooting the controller. Thanks Pitmix for your youtube video on cyclurba on how to setup the controller. It was useful.
Cheers,
Peterfr