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Modes have replaced Do Not Disturb on your Pixel. Here's how to use them
Google has streamlined some of its quick settings toggles in Android in a single menu called Pixel Modes.
Android 15 is the latest flavor of Google's smartphone operating system, and like most software, it's constantly evolving and changing based on user feedback. Google now lets you create custom modes on a Pixel phone and access it through a dedicated menu from the quick settings screen. Note: There's no way to revert your choice when choosing to activate a mode automatically based on calendar events or date and time, which is a strange limitation.
Or read this on Android Central