The final option, Other, hides the setting for the most interesting UI tweak, power notification controls. Turn it on and it will add a slider to the individual app settings inside the Notifications settings. Divided into six levels, they are intended to give you granular control over the notifications you receive, from blocking all alerts to preventing full-screen interruptions and peeking.
At one time, the Other tab also included toggle for enabling a split-screen swipe up gesture, but that has since been removed. That’s kind of the point with the System UI Tuner. With any given update, options can be added or taken away with nary a warning. It’s one of those fun elements that Google provides to users in the know (kind of like those cat Easter eggs), and once you activate it, you’ll likely never want to turn it off.
But if you ever want to, it’s much easier to find. Just tap the three dots in the right corner and select Remove from Settings.
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