This post explains why BitLocker might be missing or not showing in Control Panel on your Windows 11/10 and the steps you can take to resolve the issue.

In such cases, you see the “Windows cannot be installed on this hard disk space. BitLocker Drive Encryption is enabled on the selected partition.

Fix BitLocker error E_FVE_TPM_NOT_DETECTED, The booting system doesn't have or doesn't detect a TPM in Windows 11/10.