There are 2 different ways to customize the style of your Hotspot Beacons. To change the default settings for your hotspots visit the Themes Tab within you Panel.
For more details check out this article.

You can also customize your hotspot beacons individually. In the extension, on the Hotspot Detail Screen , click on the Beacon tab in order to define the color and size options of your Beacon.

Related Articles:

Managing Hotspots
How to change the hotspot settings from the panel?

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