VSC/platformio: "Switch project environment" gone

Folks,
Step 3 of the build process (Building Meshtastic Firmware | Meshtastic), platformio: Switch Project Environment is somehow gone into my VSC/platformio installation, although i did not change anything in the installation.
Searching this command gives no result.
Did someone observe this before? What could be the reason and the solution?
Regards…

Oh, i see now that it is possible to click on the lower blue line to switch the project envirenoment. Anyway it is strange that the command line disappeared from the command palette…