Among the notable changes to the MAX flight controls:

• The plane's Maneuvering Characteristics Augmentation System, or MCAS automated flight control system, will now receive data from both angle of attack sensors, instead of just one.

• If those disagree by more than 5.5 degrees, the MCAS system will be disabled and will not push the nose of the plane lower.

• Boeing will be adding an indicator to the flight control display so pilots are aware when the angle of attack sensors disagree.

• There will also be enhanced training required for all 737 pilots so they are more fully aware of how the MCAS system works and how to disable it if they encounter an issue.

https://www.cnbc.com/2019/03/27/boeing-unveils-737-max-fixes-says-planes-are-safer.html