DANGER, DANGER, DANGER, Stay away! This app placed a POP UP over the enable and disable button in my shopify app to keep me from uninstalling it. It was a horrific nightmare. I finally used the trash can to delete it. I would NOT recommend this app or any app that's just starting out as you will have to be the ginnie pig for their trial and error.
Also, it took forever before items were added to the cart. If I could give LESS than 1 star I would.
I think this must be a misunderstanding. I guess you're previewing the "siderbar cart" function; it will generate a preview pop up over the disable/enable the button; but you can close the popup by clicking the "x" icon on popup.