Why is the delete button dimmed and not available in the Programme tool of Procore Drive?
No user, regardless of permission level, has the ability to delete anything in the Programme tool in Procore Drive. This is why the Delete button is dimmed to inform you that it is not available.
If you want to delete the programme from Procore's Programme tool, you can clear the current programme by going to the Programme tool on Procore web (app.procore.com). See Configure Advanced Settings: Project Programme.