Default behavior of flight controllers with multiple IMU

Just a question concerning redundancy ?
Its common knowledge that pixhawk has multiple IMU’s .
However other boards such as matek 765wing and 743wing also have 2 imu’s each .
To take advantage of the potential redundancy are there settings I have to make or is everything already set.
Example , x axis accelerometer on imu # 1 goes out will arduplane automatically take appropriate steps or do i have to set it all up .
I was reading about multiple kalman filters and “lanes”
In the documentation but what is behavior by default .