do not disturb from control center

You can’t. Focus is one of the items you can’t remove.

Hey there Vansmimi,

To customize Control Center on your iPhone, follow this guide: Edit Control Center on your iPhone, iPad, and iPod touch.

"How to remove a control 

1. Go to Settings > Control Center.
2. Tap the Remove button, then tap Remove next to the app or feature that you want to remove." (Retrieved from resource above)

If you don't see what you're looking for try leaving your feedback here: Product Feedback.

Take care.