Zephyr Workbench, a VSCode extension to manage Zephyr on STM32.
It enables users to easily create, develop, and debug Zephyr applications.
Main features:
Install host dependencies.
Import toolchain and SDK.
Create, configure, build and manage apps.
Debug STM32.
You can directly download it from the VSCode marketplace
For more details, visit the Zephyr Workbench
Sorry but there is no simulation implemented on System Workbench yet.
I don’t know if it works but maybe you can used QEMU as processor emulator and upload your code on the emulator then to simulate.