This is the most relevant entry I found related to the topic:

“Managing Project Access

For Individual Projects

To manage access to an individual project:

Learn more about sharing”

Goal: create the Nim schematic on your NUCLEO-G031K8 with 12 LEDs (GPIO sink at 3.3 V) and 6 switches to GND (internal pull-ups).

Plan:

Please click Start on the plan bar to execute. If Start is still disabled, confirm the project is editable (not read-only) and that you’re in the editor for this project, not a published part preview.