You can pause a plug by visiting your Plugs page. The Plugs page is accessible by the main left-side menu or by visiting directly this URL, (logged-in users).
In the Plugs table, find the plug that you wish to Pause and click the green "ACTIVE" button in its corresponding row and wait for the system to update. Once successful the status of your plug will be updated to "Paused" and your shoppinh cart will inaccessible for this plug.
You can similarly re-activate a plug by clicking the "PAUSED" button in its corresponding row.
If for any reason your plug has no products attached or payment gateways linked, the plug will automatically be Paused and inaccessible to your page visitors.