There are two different ways to customize the style of your Hotspot beacons. If you want to change the default settings for your Hotspots, you can visit the Themes tab within your Panel. For more details, check out this article.
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You can also customize your Hotspot beacons individually. In the extension, while editing a Hotspot, click on the Beacon tab to define your Beacon's color, size, and other options.