What stays and what goes when you switch the plugin off or delete it.
Go to Plugins and click Deactivate. Your pages and settings are kept. Widgets from the plugin stop showing on your pages until you activate it again.
Pro adds 77 widgets, 10 extensions, a Theme Builder and 32 dynamic tags, and keeps every free widget. From $18 a year, with a 14-day money-back guarantee.
Deleting the plugin from the Plugins screen also removes its own settings, such as the list of switched off widgets. With Pro, the Instagram connection and cached feeds are removed too.
Your pages are not changed. The widget settings stay inside each page, so the widgets show again if you install the plugin later.