I don't click on it. I leave the right side and the left side intact -- I click Review, eyeball the results, and go straight on to Accept, do not pass Go, do not collect $200 for clicking things.
Clicking once on the arrow will reject the downloaded values and present the "result" for approval.
Clicking twice merges values and presents the results for approval.
Clicking zero times merges values after you click Accept.
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