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.
The image shows that you chose to use StdPeriph liberary, so where did you install the liberary?
And BTW, as a new project started, it suggests to use CubeHal instead of StdPeriph.