In your AppScenic Dashboard, click on Account, and Integrations.
Now here you can find all your stores, so first find the store you want to delete.
Then click on the ACTIONS button on the other side of that store.
Choose Disconnect, in case you haven't done that already, confirm your update and click on SAVE. This will change the STATUS of your store to OFFLINE.
Depending on your platform's store, you will need to wait a bit until you can also delete it from AppScenic.
Once that's possible, you have to click again on the ACTIONS button of the same store, choose Delete and then SAVE.
And now your store is disconnected and deleted from AppScenic.