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.
This behavior is a known bug and it was fixed in the System Workbench V2.3.
So I suggest you to update your System Workbench or download the latest installer.