It isn't, unless someone else has access to your account and enabled it for you.
The button, which was unchecked, say "Disable infinite scroll".
It appears to be the current default.
Didn't used to be, but now it is.
I think you are talking about another account.
I've checked the current account's metadata you've been using to discuss with me and you never setup anything for it.
[Edit: I should only have one account here unless I got totally blasted and made another. But doesn't the screenshot about make it seem as though infinite scroll is default?]
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