missing 'Ac6 STM32 Debugging' Debug configuration in Debug perspective
To erase Flash and manage configuration you had to install STM32CubeProgrammer, see screenshot.
It has no core management as STM32 stlink-utility but has enough functionality to manage flash and protection registers, plus st-link firmware upgrade.
If required I use stlink utility on an XP box Virtualbox hosted on Linux and it work fine.