Personalised Recommendations allows you to easily control which widgets get displayed on the page via a small snippet that can be added to your Shopify theme.
window._rkWidgetIds = [widget1_id, widget2_id]
The window variable
_rkWidgetIds specified by you will be the only ones displayed by our recommendation system on the page once it loads.
How to locate the widget id ?
You can find the widget's id under the Settings tab of the widget detail screen.
To display only the above widget the snippet would be:
window._rkWidgetIds = 
Widget detail screen can be opened by clicking Configure on the widget in the homepage.