I am assuming that you are having Jetpack version > 3.3 on the target board.This issue is regarding the change of the display environment value on the target board for Jetpack version > 3.3. For this version of Jetpack, before running the application on the target board, you should set the display environment in MATLAB using hwobj.setDisplayEnvironment('value') (hwobj is the object of jetson or drive class). This setting is available from R2019a version of MATLAB, as you are using R2019b MATLAB, you will have this.
To obtain the display environment value, please log in to the target board and run the below command.
expected output: "0.0" for Jetpack <= 3.3 and "1.0" for Jetpack > 3.3.
Create a hardware object for the target board.
hwobj = jetson('ip address','user name','password');
Set the target display environment in MATLAB using
Run the application on target board using
You will be able to see the display window on target monitor.