How Do I Deactivate the Plugin?

To deactivate PBS, first log into your Dashboard / backend, then navigate to Plugins > Installed Plugins:

When in the Plugins page, scroll down your list of plugins and find the one for Page Builder Sandwich. Right below the name, you should be able to see a deactivate link along with other links such as Edit or Change License (this may vary in your site). Click the deactivate link to disable the plugin.