How the LucidFlex drawdown moves
Lucid writes that "LucidFlex evaluation and funded accounts use an End-of-Day Drawdown (EOD Drawdown) system to calculate the Max Loss Limit (MLL)". At the end of each session the system takes your highest closing balance, and the floor sits one drawdown below it. It rises when you close at a new high and never comes back down.
End of day means a trade that runs up during the session and comes back before the close does not raise the floor. Only the closing balance counts for moving it.
Where it locks
Each account has an Initial Trail Balance: $26,100 on a 25K, $52,100 on a 50K, $103,100 on a 100K and $154,600 on a 150K. Once the account exceeds it, Lucid writes, "the MLL locks and no longer moves", at the starting balance plus $100. From that point the drawdown is effectively static.
A payout locks it too. Lucid's page says that "once you request a payout from LucidFlex, your MLL automatically adjusts to the Locked MLL Balance".
A 50K account, three days
The floor starts at $48,000. You close day one at $51,000, so day two starts with the floor at $49,000. You close day two at $52,500: that is above $52,100, so the floor stops at $50,100 instead of rising to $50,500. You close day three at $53,000 and the floor is still $50,100, with $2,900 of room.
The lock helps only after the account has grown. Before that, every good close tightens tomorrow: after the $51,000 close, a red day of $2,000 ends the account even though it is still $1,000 above where it started. The calculator above is filled with these three days; change them to yours.
What usually breaks it
Floors rarely break on a single bad trade sized correctly. They break on the stop moved further away, or on the trade taken right after a loss to win it back. Those are habits, not rules, and that is where the free diagnostic below starts.