I’m just as annoyed as you are. Came here looking for answers, but the answer is that they took the option away. So now you’re stuck with this with NO control over it or way to turn it off.
I suggest adding your Vote to this Request thread I stumbled across: Add tab cascade layout back to android
UPDATE:
Confirmation that this is NOT a bug and that they removed it on purpose: https://github.com/brave/brave-browser/issues/21005