Plenty of Google Pixel users took to Reddit to complain about this change. Fortunately, there are easy ways to fix this behavior.
Restore one-tap Do Not Disturb to your Google Pixel smartphone
Once the tile is there, you can rearrange it as you see fit. Just swipe down from the top of your Pixel's screen and select the pencil icon to edit and reorder your quick settings tiles. You can use this to move the new Do Not Disturb button to your preferred location. This app was developed by someone who faced the exact same problem after the update, and doesn't do anything other than restoring the old Do Not Disturb button.
Lock screen > Shortcuts. Now select one of the shortcuts and pick Do Not Disturb to add it there.
Tips & support > Send feedback. Be sure to describe the problem in detail so that the person reading it can understand the issue and pass it on to the relevant team accordingly.
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