This is abnormally quick battery drain for a brand-new M1 MacBook Air.
First, update your MacBook to the latest version of macOS and see if the problem persists: Update macOS on Mac - Apple Support
If the problem persists, you can use the Activity Monitor app to see which process is draining your battery: View energy consumption in Activity Monitor on Mac - Apple Support
If an app you installed is the culprit, consider uninstalling the application or contacting the publisher of the application. If there doesn't appear to be a particular process rapidly draining your battery, consider reaching out to Apple Support. Your MacBook is covered by a one-year warranty, even if you didn't purchase AppleCare+. Contact - Official Apple Support