I discovered accidentally the test mode when I was trying "Master Reset", see
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Apparently they made Copy/Paste from another Garmin device support page, because there is instruction "release the Start button" while Garmin Instinct has no "Start" button, so I had to use "Trial and error" approach.

Note:
In firmware version 6.60 items in Test Mode are reformatted and adapted to the Instinct's display, so that no item is hidden.

Note 2:
ABC button is enough for entering into test mode! See comments.

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