If you are unable to change the default location for the BitLocker recovery password in Windows 11/10, you need to check your Group Policy or Registry settings as mentioned in this post.

If Bitlocker says that Your recovery couldn’t be saved to a location and asks you to change it, follow the instructions mentioned below. 1. Press Windows Key + R combination and put gpedit.msc ...

BitLocker is one of the simplest ways to encrypt an external drive on Windows, as long as you're using it with Windows devices. It's just one of many security features in Windows 11.