You are not missing something. I have the same problem. My solution: I have to identical sections; the first with a slider and the second without. When the user opens the report he sees the full period. If he want to change the period he switches to the other section. I have the same problem when I use a drop down list with months. Then I wish that I could set default value to current month. There I have a similar solution, where the first sections only show current month, and to see the historical data, the user has to change sections.
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