Right now, your Mac can only boot with the USB drive plugged in. To make the patch permanent:
Unlike older patchers that modified the macOS system files directly (which breaks modern Apple security features like FileVault and System Integrity Protection), OCLP leaves the operating system intact. It works by dynamically applying patches to the bootloader, allowing your Mac to run vanilla macOS updates straight from Apple. OpenCore Legacy Patcher Download: Where to Get It Safely open core legacy patcher download