To turn off Bitlocker encryption on Windows 10 or 11 personal devices, in the search box enter "control panel" then open the Control Panel.
Navigate to System and Security
then to Bitlocker Drive Encryption
and then click "Turn off BitLocker."
Windows will take some time to decrypt your drive.
To learn more about BitLocker and potential concerns when enabling or turn it off, please go to BitLocker overview - Windows Security | Microsoft Learn