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 agree with dautrevaux. Unchecking "Generate under root" is just hiding the problem, not really solving it. Source code management in this becomes extemely inconvenient as well as directory structure in the project.