Removing an add-in or connector is very simple. Open the Add-ins & Connectors panel, from either the client (Home > Get Add-ins) or the web app (three dots > Get Add-ins), and click on “My add-ins” (if you’re on the Connectors tab, this option is in the same place, but it’s called “Configured”).
Find the add-in you want to disconnect, click the three dots, and in the menu that appears, choose “Remove.”
Close the Add-in & Connectors panel using the “x” in the top right. The add-in will be immediately removed, both in the client and the web app.