Can I delete a folder that contains a strategy with an active order, but the strategy is now deactivated (unchecked and no light bulb next to it)?

No, you cannot delete a strategy that has placed an order and it is still active, but the strategy is switched off (the tick is unchecked and the light is not on). Wait until all orders in the MoonBot terminal for that strategy are closed and only then you can delete it. Recommendation: Do not delete strategies that you do not need at this stage, but create a Trash folder and move them there. You may need them again after some time and you will be able to retrieve them from there. You can clean out the Trash folder and delete strategies you don’t need once a week.