After rooting and unlocking the bootloader, I can't enable Engineering Mode.

Hello dear friends, I have a Note 14 Pro (malachite). I run the root and bootloader unlock process via ADB; the tool indicates everything went correctly. I put the device in fastboot mode, but when I try to flash the eng firmware, it says it's not possible—as if the bootloader were still locked, even though the tool reports success.

hello....if active slot is a...switch slot to b from fastboot tab...you will see bootloader is unlocked than flash eng...or if active slot is b than switch a

Is that after rooting and unlocking the bootloader? And how do I know which partition is the selected one?

After root and bootlaoder unlock procces reboot to fastboot mode and set active slot b...from fastboot tab than you will see,bootloader is already unlocked