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There is a limitation with the What if parameter:
"Parameters can have at most 1,000 unique values. If a parameter has more than 1,000 unique values, the parameter values get evenly sampled."
https://learn.microsoft.com/en-us/power-bi/transform-model/desktop-what-if#considerations-and-limita...
In a single-value slicer, I want all values—even those exceeding 1,000—to be displayed as unique, rather than being sampled.
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