Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
I also find this button a bit confusing since you have run/play button in debugging perspective as well. Often I hit the run button in C/C++ perspective and expect to start debugging 😊