Hi there, so the game runs on order system. You build a town, that takes an order. You demolish a building, that takes an order. And orders take a certain amount of turns to complete. So It might be that you did set up a demolish building, but the turn didn't tick over to finish the order. Or there's a bug I haven't spotted yet.
You are right that the tutorials are very janky. Ideally I want to make some pop up videos (like into the breach) to just show people what to do, instead of using text. And make the overall ui clearer.
Thanks for playing and giving such detailed feedback, its a massive help.