best response confirmed by IoTGirl (Microsoft)
Solution

@Yggdrasill If you go into the general settings section of the visual, you will see there is an option to show negative values. When turned on, it's absolute value is used for relative scaling of sizes, but the popup will still display the correct negative value when hovered. More details here: https://docs.microsoft.com/en-us/azure/azure-maps/power-bi-visual-understanding-layers#general-layer...

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