Hi there, @Adam_Brownie and welcome to the Community 
Thank you so much for the feedback!
This feature would really make sense if multiple sources were supported in the Google Reviews, but currently you can add only 1 source per widget. If you’d like to add multiple sources to 1 widget, feel free to upvote this idea - Multiple sources within 1 widget.
The good news is that both options (multiple sources and filters) are supported in our All-in-One Reviews app.
For example, you can add multiple Google Reviews locations and set the location as the source name:
After that, you should enable Tabs on the Header tab. This will let your website visitors filter reviews by locations:
If you have any questions left, we’re always here to help 