There are 2 ways to build C/C++ code from the model, in R2019b:
a. Use the keyboard shortcut: Ctrl+B
b. Using the User Interface as follows:
- Go to Apps
- Search for Simulink Coder
- A panel for Code generation will be visible
- It has a 'Build' icon on it.
The following is the screenshot for the same:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/296278/image.png)