In order to show an accordion of your Widgets, first, you have to add the widgets to this plugin widgets area.
Go to your site admin > Appearance > Widgets. Here add your widgets under the WPB Widgets Accordion area as like as the screenshot. Make sure you add a title to all the widgets, the title is required for the accordion.
If you successfully added the widget to the WPB Widgets Accordion widget area, now next step is to show these widgets in an accordion. For this, you have to add our shortcode where you want to show these widgets accordion. You can use a text widget to add our shortcode on the widget area. Follow the screenshot below –
And here is the result.