Detrend = CURVE not working

Can anybody tell me why the Detrend = CURVE; does not have any effect on my displayed price chart?

I tried setting the LEAN flag and removing historical data that I am not using, but the price curve still shows its distinct trend.

The lookback period is included in the detrending, so the plotted price curve might still start and end at slightly different levels.

Yes I forgot the default lookback. Sorry for that noob questions, Ill look more careful next time.