It’s currently not possible to create a date range filter without selecting a start date and an end date. It would be great if we could leave both empty so that the analysis/dashboard includes all dates by default.
I found a workaround but it takes so many more steps:
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Change the date range filter to a relative date filter.
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Add it as a control or to the sheet.

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Open the control and choose any date range.

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Close the control and select Reset.

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The date filter now shows “All”.

