I just noticed a new question filter button in the UI.

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  1. When was it introduced?

  2. Did I enable it unknowingly?

  3. Is it a public or test release?

  4. Is there a blog post announcing it's addition?

  5. Can it be disabled/turned-off?

  6. Is it available on all the network sites?

  7. Is it available to all the users irrespective of reputation?


Yes, this is the so-called Custom Filters feature, which has been released today after being alpha-/beta-tested for almost a year as Custom Question Lists. You can find most information you're looking for in the first link, which leads to the announcement of the feature on Meta Stack Exchange.

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