: New functions like tiledlayout and nexttile for flexible plot arrangements, and a new colororder function for easier color control. Update 1 Specific Enhancements

: Enhanced stability for long sessions and the ability to create interactive tasks for common workflows.

: A modern interface that replaced traditional menus to improve workflow and tool discoverability.

: Cosmetic fixes for Simulink Coder examples and System Composer templates. System Requirements for R2019b R2019b Updates Release Notes - MathWorks

: Up to 16x faster string array assignments and improved performance for small string arrays.

Released on October 10, 2019, Update 1 addressed several critical bugs and refined existing features:

: Faster tab completion in the MATLAB Command Window and improved speed in the Simulink Editor.