https://wccftech.com/how-to/how-to-downgrade-from-android-11-beta-to-android-10-on-google-pixel-phones/

Android 11 beta 1 is finally available to everyone who had enrolled themselves in the company's beta testing program. The platform is looking to bring a handful of new additions to the table along with numerous UI design variations. However, you have to take note that the beta build of the Android 11 is not for everyone. If you change your mind, you can downgrade Android 11 back to Android 10 right now.

If you're not familiar with the beta builds, they tend to carry a plethora of bugs that distort the device's normal use. Apps are sometimes off-balance, the interface hangs on you, apps tend to crash a lot, and a boatload of other issues. Moreover, you should never install beta builds on your primary device. However, you always have the option available to downgrade your device from Android 11 beta to the stable Android 10 build.