How do I enable SEANDROID ENFORCING on adb within TWRP?

When I boot into TWRP Recovery, it says:

RECOVERY IS NOT THE APPLICATION OF ISOLATION

but when I run sestatustells me

SELinux status: enabled
Assembly of SELinuxfs: / sys / fs / selinux
Current mode: permissive
Mode from the configuration file: permissive
Policy version: 26
Configuration file policy: sepolicy

How do I configure the SEANDROID ENFORCING?