The map extent is automatically calculated, but it needs at least two points in order to properly determine the highest possible zoom level. I see in the provided screenshot that you have one point - in this case you could to preprocess the data in the data source and make sure every GeoLocation group would have at least two members (points) with different coordinates. For detailed instructions please check the following KB article:
How to set the Map extent dynamically when showing a single data point
I hope this will be helpful.
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