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Simple enough: when your treadmill has the Stop key held down, and you insert the safety key, then it goes into Information Mode.
To get out of that mode, release the Stop button (or make sure it is not stuck down, by tapping it sharply), then remove the safety key.
If when you next insert the safety key, you are not pressing the Stop button but it still goes into Information Mode, then your console has a problem and may have to be replaced - rather an expensive repair in most models.
(Is your treadmill under warranty still? how old is it? if within warranty, the console replacement or servicing would be free of charge.)
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