How do you show a 'step slider' in a custom chart?

Enable the step slider in a custom chart by switching to a historyTable query and toggling the option.

Enable this option on the “Other settings” page of the custom chart editor. Changing the query to use a historyTable instead of a summaryTable provides the option to “Show step selector” in the custom chart editor. This feature includes a slider for selecting the step.

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Charts