How to set the I2C clock speed command of the Mateksys H743 WING V3?

Ground Control Software Mission Planner
1

As it seems very hard to calibrate the compass from a M10Q-5883 due to possible I2C problems,
Mateksys recommend to send this command: set i2c_speed= 200KHz

However there must be a parameter somewhere to achieve this?

2

This recommendation for the INAV platform There is no need to change the speed of the I2C port for the ARDUPILOT platform