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With the latest version I just released, you should see something like this - there's a thermometer icon which you can click to toggle between various styles of heat maps. If it still doesn't work after upgrading to v2019.9.11 let me know.

Thanks for reporting this! I have updated all icons and this will be fixed in the next release.

Thanks - so the problem is it's doing a "sort" (default behavior) instead of doing the heat map. This is a layering issue - I will look into it since it works fine on my end.

Fixed for next release! It as a simple CSS conflict.