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 was posted slightly before cartu38 provided the fix)
Small update: If I use the "Quick Access" in the top right corner of the screen and type "program chip" then it opens the correct dialogue. Odd that it's gone off the menu, though.